Shikata, Y.; Adhikari, M. R.; Tsagas, G.; Klingenberg, W. A note on infinite existence of closed geodesics on spheres. (English) Zbl 1087.53038 Bull. Calcutta Math. Soc. 97, No. 4, 365-370 (2005). Reviewer: Marian Ioan Munteanu (Iaşi) MSC: 53C22 53C20 PDFBibTeX XMLCite \textit{Y. Shikata} et al., Bull. Calcutta Math. Soc. 97, No. 4, 365--370 (2005; Zbl 1087.53038)
Tsagas, Gr.; Adhikari, M. R.; Rahaman, M. Lie group actions on manifolds. (English) Zbl 1073.22013 J. Calcutta Math. Soc. 1, No. 1-2, 59-64 (2004). MSC: 22F05 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., J. Calcutta Math. Soc. 1, No. 1--2, 59--64 (2004; Zbl 1073.22013)
Tsagas, Gr.; Tapanidis, Th.; Kortesis, S.; Synefaki, A.; Christophoridou, Ch. Determination of characteristically nilpotent Lie algebras. (English) Zbl 1125.17307 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 2002. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-08-8/pbk). BSG Proceedings 11, 141-152 (2004). MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., BSG Proc. 11, 141--152 (2004; Zbl 1125.17307)
Tsagas, Gr.; Kalogeridis, K. The spectrum of the Laplace operator for the manifold \(SO(2p+2q+1)/SO(2p)\times SO(2q+1)\). (English) Zbl 1069.58019 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 2001. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-07-X/pbk). BSG Proceedings 10, 188-196 (2004). Reviewer: Hans-Bert Rademacher (Leipzig) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{K. Kalogeridis}, BSG Proc. 10, 188--196 (2004; Zbl 1069.58019)
Tsagas, Gr.; Tsonis, Ath. Classification of isounits. (English) Zbl 1405.17061 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Aristotle University of Thessaloniki, Greece, August 27 – September 1, 2000. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-06-1). BSG Proceedings 9, 187-190 (2003). MSC: 17D99 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ath. Tsonis}, BSG Proc. 9, 187--190 (2003; Zbl 1405.17061) Full Text: Link
Tsagas, Gr.; Katsiaris, D.; Panos, S. Unification of the Lie algebras \(so(p,q)\), \(p+q=n\), \(p=1,\dots,n\), \(q=0,\dots,n\). (English) Zbl 1404.17016 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Aristotle University of Thessaloniki, Greece, August 27 – September 1, 2000. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-06-1). BSG Proceedings 9, 184-186 (2003). MSC: 17B20 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., BSG Proc. 9, 184--186 (2003; Zbl 1404.17016) Full Text: Link
Tsagas, Gr.; Katsiaris, D.; Panos, S. Unification of the Lie algebras \(u(p,q)\). (English) Zbl 1404.17015 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Aristotle University of Thessaloniki, Greece, August 27 – September 1, 2000. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-06-1). BSG Proceedings 9, 176-183 (2003). MSC: 17B20 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., BSG Proc. 9, 176--183 (2003; Zbl 1404.17015) Full Text: Link
Tsagas, Gr.; Bitis, Gr. On the harmonic and Killing tensor fields on a compact Riemannian manifold. (English) Zbl 1404.53051 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Aristotle University of Thessaloniki, Greece, August 27 – September 1, 2000. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-06-1). BSG Proceedings 9, 165-175 (2003). MSC: 53C20 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Gr. Bitis}, BSG Proc. 9, 165--175 (2003; Zbl 1404.53051) Full Text: Link
Tsagas, Gr. On the Killing tensor fields on a compact Riemannian manifold. (English) Zbl 1404.53050 Tsagas, Grigorios (ed.), Proceedings of the conference on applied differential geometry and general relativity and the workshop on global analysis, differential geometry and Lie algebras, Aristotle University of Thessaloniki, Greece, August 27 – September 1, 2000. Bucharest: Geometry Balkan Press; Bucharest: Balkan Society of Geometers (ISBN 973-8381-06-1). BSG Proceedings 9, 158-164 (2003). MSC: 53C20 PDFBibTeX XMLCite \textit{Gr. Tsagas}, BSG Proc. 9, 158--164 (2003; Zbl 1404.53050) Full Text: Link
Tsagas, Gr.; Kalogeridis, K. The spectrum of the symmetric space SP(\(I\))/SU(\(l\)). (English) Zbl 1053.58016 Balkan J. Geom. Appl. 8, No. 1, 109-114 (2003). Reviewer: Peter B. Gilkey (Eugene) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{K. Kalogeridis}, Balkan J. Geom. Appl. 8, No. 1, 109--114 (2003; Zbl 1053.58016) Full Text: EuDML
Tapanidis, T.; Tsagas, Gr.; Mazumdar, H. P. Application of scaling group of transformations to viscoelastic second-grade fluid flow. (English) Zbl 1060.76010 Nonlinear Funct. Anal. Appl. 8, No. 3, 345-350 (2003). Reviewer: F. M. Mahomed (Johannesburg) MSC: 76A10 76M60 PDFBibTeX XMLCite \textit{T. Tapanidis} et al., Nonlinear Funct. Anal. Appl. 8, No. 3, 345--350 (2003; Zbl 1060.76010)
Tsagas, Gr. Special vector fields on a compact Riemannian manifold. Reprints. (English) Zbl 1161.53342 Tsagas, Grigorios (ed.), Applied mathematics. Selected papers from the international congress, Thessaloniki, Greece, August 16–21, 1976. Bucharest: Fair Partners Publishers (ISBN 973-99985-6-9/pbk). Handb., Treatises, Monogr. 28, 131-138 (2002). MSC: 53C20 PDFBibTeX XMLCite \textit{Gr. Tsagas}, in: Applied mathematics. Selected papers from the international congress, Thessaloniki, Greece, August 16--21, 1976. Bucharest: Fair Partners Publishers. 131--138 (2002; Zbl 1161.53342)
Nerantzi, P.; Tsagas, Gr. A family of metrics with special sectional curvature on a Riemannian manifold. (English) Zbl 1137.53312 Hadronic J. 25, No. 1, 41-52 (2002). MSC: 53B30 PDFBibTeX XMLCite \textit{P. Nerantzi} and \textit{Gr. Tsagas}, Hadronic J. 25, No. 1, 41--52 (2002; Zbl 1137.53312)
Tsagas, Gr.; Bălan, V. Note on Finslerian \(G\)-structured special homogeneous manifolds. (English) Zbl 1150.14304 Sci. Bull., Ser. A, Appl. Math. Phys., Politeh. Univ. Buchar. 64, No. 2, 3-8 (2002). MSC: 14M17 58B20 53C10 53B40 53C60 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{V. Bălan}, Sci. Bull., Ser. A, Appl. Math. Phys., Politeh. Univ. Buchar. 64, No. 2, 3--8 (2002; Zbl 1150.14304)
Agrafiotou, X.; Tsagas, Gr. Solutions of the partial differential equation \(rt-s^ 2=0\) with boundary conditions. (English) Zbl 1085.35510 Commun. Appl. Anal. 6, No. 3, 325-329 (2002). MSC: 35J60 35C05 35A30 PDFBibTeX XMLCite \textit{X. Agrafiotou} and \textit{Gr. Tsagas}, Commun. Appl. Anal. 6, No. 3, 325--329 (2002; Zbl 1085.35510)
Tapanidis, T.; Tsagas, Gr.; Mazumdar, H. P. On the symmetries of the differential equation governing damped harmonic vibration. (English) Zbl 1038.34039 Nonlinear Funct. Anal. Appl. 7, No. 3, 473-480 (2002). MSC: 34C14 74H45 PDFBibTeX XMLCite \textit{T. Tapanidis} et al., Nonlinear Funct. Anal. Appl. 7, No. 3, 473--480 (2002; Zbl 1038.34039)
Tsagas, Gr.; Agrafiotou, X. Special system of linear partial differential equations. (English) Zbl 1085.35506 Commun. Appl. Anal. 5, No. 4, 497-501 (2001). MSC: 35E20 35C05 35F30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{X. Agrafiotou}, Commun. Appl. Anal. 5, No. 4, 497--501 (2001; Zbl 1085.35506)
Tsagas, Gr.; Nerantzi, Polyxeni A family of metrics with strictly positive sectional curvature on a Riemannian manifold. (English) Zbl 1031.53040 Tsagas, Grigorios (ed.), Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press. BSG Proc. 6, 226-238 (2001). Reviewer: Jesus Muciño-Raymundo (Morelia) MSC: 53B21 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{P. Nerantzi}, BSG Proc. 6, 226--238 (2001; Zbl 1031.53040)
Tsagas, Gr.; Tsonis, Ath. Elements of isoanalysis on \(\hat{\mathfrak R}^n\) isostructures on \(\hat{\mathfrak R}^n\). (English) Zbl 1022.58003 Tsagas, Grigorios (ed.), Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press. BSG Proc. 6, 220-225 (2001). MSC: 58A99 53A99 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ath. Tsonis}, BSG Proc. 6, 220--225 (2001; Zbl 1022.58003)
Tsagas, Gr.; Agrafiotou, X. Special systems of partial differential equations. (English) Zbl 1018.35016 Tsagas, Grigorios (ed.), Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press. BSG Proc. 6, 213-219 (2001). Reviewer: Messoud Efendiev (Berlin) MSC: 35F20 17B25 22E60 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{X. Agrafiotou}, BSG Proc. 6, 213--219 (2001; Zbl 1018.35016)
Tsagas, Gr. Conformally flat manifolds and spectra of elliptic operators. (English) Zbl 1022.58015 Tsagas, Grigorios (ed.), Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press. BSG Proc. 6, 206-212 (2001). Reviewer: J.Eichhorn (Greifswald) MSC: 58J53 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, BSG Proc. 6, 206--212 (2001; Zbl 1022.58015)
Tsagas, Gr. Nilpotent Lie algebras of maximal rank and of type \(F_4\) as an associated generalized Cartan matrix. (English) Zbl 1039.17010 Tsagas, Grigorios (ed.), Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press (ISBN 973-99669-9-3/pbk). BSG Proc. 6, 176-205 (2001). Reviewer: Melih Boral (Adana) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas}, BSG Proc. 6, 176--205 (2001; Zbl 1039.17010)
Mizushima, Masataka; Tsagas, Gr. Gravito-radiative force (detection of gravitational waves). (English) Zbl 1033.83012 Tsagas, Grigorios (ed.) et al., Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press (ISBN 973-99669-9-3/pbk). BSG Proc. 6, 148-157 (2001). Reviewer: Volker Perlick (Berlin) MSC: 83C35 83B05 PDFBibTeX XMLCite \textit{M. Mizushima} and \textit{Gr. Tsagas}, BSG Proc. 6, 148--157 (2001; Zbl 1033.83012)
Koukouvinos, T.; Kobotis, A.; Tsagas, Gr. Elimination of concealed isomorphic Lie algebras from nilpotent Lie algebras of dimension eight whose maximum Abelian ideal is of dimension five. (English) Zbl 1039.17009 Tsagas, Grigorios (ed.), Proceedings of the conference on geometry and its applications in technology and the workshop on global analysis, differential geometry and Lie algebras, Thessaloniki, Greece, 1999. Bucharest: Geometry Balkan Press (ISBN 973-99669-9-3/pbk). BSG Proc. 6, 115-120 (2001). Reviewer: Melih Boral (Adana) MSC: 17B30 PDFBibTeX XMLCite \textit{T. Koukouvinos} et al., BSG Proc. 6, 115--120 (2001; Zbl 1039.17009)
Tsagas, Gr.; Tsonis, Ath. Structure of the isounits. (English) Zbl 1087.17503 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Thessaloniki, Greece, July 1997. Bucharest: Geometry Balkan Press (ISBN 973-99669-6-9/pbk). BSG Proc. 5, 130-137 (2001). MSC: 17A99 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ath. Tsonis}, BSG Proc. 5, 130--137 (2001; Zbl 1087.17503)
Tsagas, Gr.; Katsiaris, D.; Panos, S. Unification of the nilpotent Lie algebras of dimension three and four. (English) Zbl 0991.17011 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Thessaloniki, Greece, July 1997. Bucharest: Geometry Balkan Press. BSG Proc. 5, 125-129 (2001). Reviewer: M.Boral (Adana) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., BSG Proc. 5, 125--129 (2001; Zbl 0991.17011)
Tsagas, Gr.; Agrafiotou, X. Classification of nilpotent Lie algebras of maximal rank and given type. (English) Zbl 0991.17010 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Thessaloniki, Greece, July 1997. Bucharest: Geometry Balkan Press. BSG Proc. 5, 117-124 (2001). Reviewer: M.Boral (Adana) MSC: 17B30 17B67 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{X. Agrafiotou}, BSG Proc. 5, 117--124 (2001; Zbl 0991.17010)
Tsagas, Gr. Spectra and foliation. (English) Zbl 1087.53506 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Thessaloniki, Greece, July 1997. Bucharest: Geometry Balkan Press (ISBN 973-99669-6-9/pbk). BSG Proc. 5, 108-116 (2001). MSC: 53C12 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, BSG Proc. 5, 108--116 (2001; Zbl 1087.53506)
Tsagas, Gr.; Bitis, Gr. On the harmonic and Killing tensor field on a compact Riemannian manifold. (English) Zbl 1038.53037 Balkan J. Geom. Appl. 6, No. 2, 99-108 (2001). Reviewer: Shen Yi-Bing (Hangzhou) MSC: 53C20 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Gr. Bitis}, Balkan J. Geom. Appl. 6, No. 2, 99--108 (2001; Zbl 1038.53037) Full Text: EuDML EMIS
Alexiou, D.; Tsagas, G.; Frangakis, C. Conditions for the normal rectilinear congruences whose focal surfaces are minimal. (English) Zbl 1027.53008 Int. J. Comput. Math. 77, No. 3, 335-345 (2001). Reviewer: Richard Koch (München) MSC: 53A10 53A25 53A05 PDFBibTeX XMLCite \textit{D. Alexiou} et al., Int. J. Comput. Math. 77, No. 3, 335--345 (2001; Zbl 1027.53008) Full Text: DOI
Tsagas, Gr.; Christophoridou, Ch.; Synefaki, A. Special bilinear forms on eight dimensional nilpotent Lie algebras. (English) Zbl 1009.17006 Hadronic J. 23, No. 2, 115-129 (2000). MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., Hadronic J. 23, No. 2, 115--129 (2000; Zbl 1009.17006)
Alexiou, D.; Tsagas, G. Rectilinear congruences whose focal surfaces are equalarea. (English) Zbl 1008.53016 J. Inst. Math. Comput. Sci., Math. Ser. 13, No. 3, 347-353 (2000). Reviewer: Hans Sachs (Leoben) MSC: 53A25 53A05 PDFBibTeX XMLCite \textit{D. Alexiou} and \textit{G. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 13, No. 3, 347--353 (2000; Zbl 1008.53016)
Tsagas, Gr.; Mazumdar, H. P. On the control of a dynamical system by a linearization method via Lie algebra. (English) Zbl 1009.93011 Rev. Bull. Calcutta Math. Soc. 8, No. 1-2, 25-32 (2000). Reviewer: Constantin Vârsan (Bucureşti) MSC: 93B18 93B29 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{H. P. Mazumdar}, Rev. Bull. Calcutta Math. Soc. 8, No. 1--2, 25--32 (2000; Zbl 1009.93011)
Tsagas, Gr.; Christophoridou, Ch.; Kobotis, A. The spectrum of one parameter family of operators for conformally flat manifolds. (English) Zbl 1001.53015 J. Inst. Math. Comput. Sci., Math. Ser. 13, No. 1, 85-89 (2000). Reviewer: Liviu Ornea (Bucureşti) MSC: 53C20 58J50 58J53 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., J. Inst. Math. Comput. Sci., Math. Ser. 13, No. 1, 85--89 (2000; Zbl 1001.53015)
Alexiou, D.; Baniotopoulos, C. C.; Tsagas, G. On the minimal area on membranes: Application of the theory of rectilinear congruence \(C\). (English) Zbl 1005.53009 J. Inst. Math. Comput. Sci., Math. Ser. 13, No. 1, 61-71 (2000). Reviewer: Erich Hoy (Friedberg) MSC: 53A10 74K15 PDFBibTeX XMLCite \textit{D. Alexiou} et al., J. Inst. Math. Comput. Sci., Math. Ser. 13, No. 1, 61--71 (2000; Zbl 1005.53009)
Tapanidis, T.; Tsagas, Gr.; Mazumdar, H. P. On the symmetries of the differential equation governing damped harmonic vibration. (English) Zbl 0976.34032 Balkan J. Geom. Appl. 5, No. 2, 149-155 (2000). MSC: 34C14 35A30 34A25 74H45 PDFBibTeX XMLCite \textit{T. Tapanidis} et al., Balkan J. Geom. Appl. 5, No. 2, 149--155 (2000; Zbl 0976.34032) Full Text: EuDML EMIS
Tsagas, Gr.; Koukouvinos, T. Classification of nilpotent Lie algebras of dimension eight. (English) Zbl 0985.17009 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Thessaloniki, Greece, June 24-28, 1998. Bucharest: Geometry Balkan Press. BSG Proc. 4, 141-148 (2000). Reviewer: M.Boral (Adana) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{T. Koukouvinos}, BSG Proc. 4, 141--148 (2000; Zbl 0985.17009)
Tsagas, Gr. Special Riemannian metrics on compact manifolds. (English) Zbl 0966.53021 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Thessaloniki, Greece, June 24-28, 1998. Bucharest: Geometry Balkan Press. BSG Proc. 4, 133-140 (2000). Reviewer: Marcela Popescu (Craiova) MSC: 53C20 58C40 PDFBibTeX XMLCite \textit{Gr. Tsagas}, BSG Proc. 4, 133--140 (2000; Zbl 0966.53021)
Tsagas, Gr.; Christophoridou, Ch. Topological properties of Killing tensor fields. (English) Zbl 0966.53026 Differ. Geom. Dyn. Syst. 2, No. 1, 43-49 (2000). Reviewer: A.Szybiak (Waterloo/Ontario) MSC: 53C20 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ch. Christophoridou}, Differ. Geom. Dyn. Syst. 2, No. 1, 43--49 (2000; Zbl 0966.53026)
Mazumdar, H. P.; Tsagas, Gr.; Ghosh, S. C. On the breaking of mirror symmetry in homogeneous isotropic turbulence-helicity effect. (English) Zbl 0981.76037 Balkan J. Geom. Appl. 5, No. 1, 119-128 (2000). MSC: 76F05 76D05 PDFBibTeX XMLCite \textit{H. P. Mazumdar} et al., Balkan J. Geom. Appl. 5, No. 1, 119--128 (2000; Zbl 0981.76037) Full Text: EuDML EMIS
Tsagas, Gr.; Kobotis, A.; Koukouvinos, T. Classification of nilpotent Lie algebras of dimension nine whose maximum abelian ideal is of dimension seven. (English) Zbl 0989.17005 Int. J. Comput. Math. 74, No. 1, 5-28 (2000). Reviewer: M.Boral (Adana) MSC: 17B30 17-08 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., Int. J. Comput. Math. 74, No. 1, 5--28 (2000; Zbl 0989.17005) Full Text: DOI
Tsagas, Gr.; Kobotis, A.; Christophoridou, Ch. Spectra and Einstein structure on a Riemannian manifold. (English) Zbl 1004.58019 Algebras Groups Geom. 16, No. 3, 287-295 (1999). Reviewer: W.Mozgawa (Lublin) MSC: 58J50 58J53 53C25 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., Algebras Groups Geom. 16, No. 3, 287--295 (1999; Zbl 1004.58019)
Tsagas, Gr.; Christophoridou, Ch.; Synefaki, A. Invariant bilinear forms on nilpotent Lie algebras. (English) Zbl 1012.17006 Hadronic J. 22, No. 3, 273-280 (1999). MSC: 17B30 17B40 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., Hadronic J. 22, No. 3, 273--280 (1999; Zbl 1012.17006)
Stavrinos, P.; Tsagas, Gr. Special normal rectilinear congruences. (English) Zbl 1031.53025 Rev. Bull. Calcutta Math. Soc. 7, No. 1-2, 7-10 (1999). Reviewer: Udo Hertrich-Jeromin (Berlin) MSC: 53A25 PDFBibTeX XMLCite \textit{P. Stavrinos} and \textit{Gr. Tsagas}, Rev. Bull. Calcutta Math. Soc. 7, No. 1--2, 7--10 (1999; Zbl 1031.53025)
Tsagas, Gr.; Dimou, G. Connection between differential equations and differential geometry. (English) Zbl 0943.35011 Bainov, D. (ed.), Proceedings of the 9th international colloquium on differential equations, Plovdiv, Bulgaria, August 18-23, 1998. Utrecht: VSP. 427-430 (1999). Reviewer: Emil Minchev (Sofia) MSC: 35F30 53A05 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, in: Proceedings of the 9th international colloquium on differential equations, Plovdiv, Bulgaria, August 18--23, 1998. Utrecht: VSP. 427--430 (1999; Zbl 0943.35011)
Tsagas, Gr. The spectrum of the Laplace operator for bounded domains in \(\mathbb{R}^2\). (English) Zbl 0953.58029 J. Inst. Math. Comput. Sci., Math. Ser. 12, No. 3, 243-247 (1999). Reviewer: Mircea Puta (Timişoara) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 12, No. 3, 243--247 (1999; Zbl 0953.58029)
Tsagas, Gr. Classification of nilpotent Lie algebras of dimension eight. (English) Zbl 0991.17009 J. Inst. Math. Comput. Sci., Math. Ser. 12, No. 3, 179-183 (1999). MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 12, No. 3, 179--183 (1999; Zbl 0991.17009)
Tsagas, Gr.; Christophoridou, Ch.; Synefaki, A. Determination of invariant inner product on seven dimensional nilpotent Lie algebras. (English) Zbl 0951.17004 Balkan J. Geom. Appl. 4, No. 2, 117-122 (1999). Reviewer: M.Boral (Adana) MSC: 17B30 17B40 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., Balkan J. Geom. Appl. 4, No. 2, 117--122 (1999; Zbl 0951.17004) Full Text: EuDML EMIS
Tsagas, Gr.; Nerantzi, P. Symmetric invariant non-degenerate bilinear forms on nilpotent Lie algebras. (English) Zbl 0949.17004 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Aristotle University of Thessaloniki, Greece, October 21-25, 1996. Bucharest: Geometry Balkan Press. BSG Proc. 3, 124-129 (1999). Reviewer: Daniel Beltita (Bucureşti) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{P. Nerantzi}, BSG Proc. 3, 124--129 (1999; Zbl 0949.17004)
Tsagas, Gr.; Christophoridou, Ch. Relation between topology and the Killing vector fields. (English) Zbl 0943.53025 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Aristotle University of Thessaloniki, Greece, October 21-25, 1996. Bucharest: Geometry Balkan Press. BSG Proc. 3, 115-123 (1999). Reviewer: J.D.Zund (Las Cruces) MSC: 53C20 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ch. Christophoridou}, BSG Proc. 3, 115--123 (1999; Zbl 0943.53025)
Tsagas, Gr.; Barbari, P. Lie automorphisms of special nilpotent Lie algebras. (English) Zbl 0941.17012 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Aristotle University of Thessaloniki, Greece, October 21-25, 1996. Bucharest: Geometry Balkan Press. BSG Proc. 3, 108-114 (1999). Reviewer: M.Boral (Adana) MSC: 17B40 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{P. Barbari}, BSG Proc. 3, 108--114 (1999; Zbl 0941.17012)
Tsagas, Gr.; Agrafiotou, X. Hyperbolic Kac-Moody algebras. (English) Zbl 1050.17501 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Aristotle University of Thessaloniki, Greece, October 21–25, 1996. Bucharest: Geometry Balkan Press (ISBN 973-98814-5-9/pbk). BSG Proc. 3, 104-107 (1999). MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{X. Agrafiotou}, BSG Proc. 3, 104--107 (1999; Zbl 1050.17501)
Tsagas, Gr. The spectrum of the Laplace operator for bounded domains in \({\mathbb{R}^n}\). (English) Zbl 0946.58023 Tsagas, Grigorios (ed.), Proceedings of the workshop on global analysis, differential geometry, Lie algebras, Aristotle University of Thessaloniki, Greece, October 21-25, 1996. Bucharest: Geometry Balkan Press. BSG Proc. 3, 93-103 (1999). Reviewer: Mircea Puta (Timişoara) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, BSG Proc. 3, 93--103 (1999; Zbl 0946.58023)
Tsagas, Grigoris F.; Xenos, Philippos J. Non-compact quadratic \(s\)-manifolds. (English) Zbl 0980.53063 J. Geom. 65, No. 1-2, 200-207 (1999). Reviewer: Isabel Dotti Miatello (Córdoba) MSC: 53C30 53C55 PDFBibTeX XMLCite \textit{G. F. Tsagas} and \textit{P. J. Xenos}, J. Geom. 65, No. 1--2, 200--207 (1999; Zbl 0980.53063) Full Text: DOI
Tsagas, Grigoris F.; Agrafiotou, Xanthipi Construction of system of differential equations by means of special Lie algebras. (English) Zbl 1050.17500 J. Inst. Math. Comput. Sci., Math. Ser. 11, No. 3, 197-200 (1998). Reviewer: Daniel Beltiţă (Bucureşti) MSC: 17B30 34A30 PDFBibTeX XMLCite \textit{G. F. Tsagas} and \textit{X. Agrafiotou}, J. Inst. Math. Comput. Sci., Math. Ser. 11, No. 3, 197--200 (1998; Zbl 1050.17500)
Tsagas, Gr.; Kobotis, A. Decomposition of special nilpotent Lie algebras. (English) Zbl 0926.17011 J. Inst. Math. Comput. Sci., Math. Ser. 11, No. 2, 127-133 (1998). Reviewer: M.Boral (Adana) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, J. Inst. Math. Comput. Sci., Math. Ser. 11, No. 2, 127--133 (1998; Zbl 0926.17011)
Tsagas, Gr. Determination of the geometry on a compact Lie group by the spectra of second order elliptic differential operators. (English) Zbl 0924.58105 J. Inst. Math. Comput. Sci., Math. Ser. 11, No. 2, 87-96 (1998). Reviewer: M.Puta (Timişoara) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 11, No. 2, 87--96 (1998; Zbl 0924.58105)
Dimou, G. E.; Tsagas, G. On the classification of non-symmetric homogeneous bounded domains in six dimensional complex space \(\mathbb{C}^6\). (English) Zbl 1069.32012 An. Științ. Univ. Al. I. Cuza Iași, Ser. Nouă, Mat. 43, No. 2, 223-234 (1997). MSC: 32M10 32M15 PDFBibTeX XMLCite \textit{G. E. Dimou} and \textit{G. Tsagas}, An. Științ. Univ. Al. I. Cuza Iași, Ser. Nouă, Mat. 43, No. 2, 223--234 (1997; Zbl 1069.32012)
Tsagas, Gr. Special compact positively \(k\)-pinched Riemannian manifold. (English) Zbl 0935.53019 J. Inst. Math. Comput. Sci., Math. Ser. 10, No. 1, 31-37 (1997). MSC: 53C20 53C30 PDFBibTeX XMLCite \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 10, No. 1, 31--37 (1997; Zbl 0935.53019)
Miron, R.; Balan, V.; Stavrinos, P. C.; Tsagas, Gr. Deviations of stationary curves in the bundle \(Osc^{(2)}(M)\). (English) Zbl 0902.53018 Balkan J. Geom. Appl. 2, No. 1, 51-60 (1997). Reviewer: M.Anastasiei (Iaşi) MSC: 53B40 53C22 PDFBibTeX XMLCite \textit{R. Miron} et al., Balkan J. Geom. Appl. 2, No. 1, 51--60 (1997; Zbl 0902.53018) Full Text: EuDML EMIS
Tsagas, Gr. F.; Ledger, A. J. Some properties of the flag manifolds. (English) Zbl 0889.53034 Tamkang J. Math. 28, No. 3, 211-227 (1997). Reviewer: Anna Fino (Torino) MSC: 53C30 PDFBibTeX XMLCite \textit{Gr. F. Tsagas} and \textit{A. J. Ledger}, Tamkang J. Math. 28, No. 3, 211--227 (1997; Zbl 0889.53034)
Tsagas, Gr.; Kobotis, A. The Dynkin diagram and the other elements of a class of nilpotent Lie-algebras of dimension nine. (English) Zbl 0880.17006 Algebras Groups Geom. 14, No. 2, 107-161 (1997). Reviewer: M.Boral (Adana) MSC: 17B30 17B05 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Algebras Groups Geom. 14, No. 2, 107--161 (1997; Zbl 0880.17006)
Tsagas, Gr.; Kobotis, A. Decomposition of nilpotent Lie algebras of dimension eight. (English) Zbl 0862.17004 Tensor, New Ser. 57, No. 1, 20-26 (1996). Reviewer: E.L.Stitzinger (Raleigh) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Tensor, New Ser. 57, No. 1, 20--26 (1996; Zbl 0862.17004)
Tsagas, Gr.; Dimou, G. The spectrum of the Laplace operator for a Dold manifold. (English) Zbl 0954.58023 Rad. Mat. 8(1992), No. 1, 115-125 (1996). MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, Rad. Mat. 8, No. 1, 115--125 (1996; Zbl 0954.58023)
Tsagas, Gr.; Michaleas, Ch. The spectrum of the exceptional Lie groups. (English) Zbl 0887.58058 J. Inst. Math. Comput. Sci., Math. Ser. 9, No. 3, 221-232 (1996). Reviewer: M.Puta (Timişoara) MSC: 58J50 22E30 43A80 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ch. Michaleas}, J. Inst. Math. Comput. Sci., Math. Ser. 9, No. 3, 221--232 (1996; Zbl 0887.58058)
Dimou, G. E.; Tsagas, Gr. Classification of Siegel domains of dimension 14 over \(\mathbb{C}\). (English) Zbl 0897.32002 Tensor, New Ser. 57, No. 3, 242-257 (1996). Reviewer: B.Gilligan (Regina) MSC: 32A07 32M10 PDFBibTeX XMLCite \textit{G. E. Dimou} and \textit{Gr. Tsagas}, Tensor, New Ser. 57, No. 3, 242--257 (1996; Zbl 0897.32002)
Tsagas, Gr.; Christophoridou, Ch.; Synefaki, As. Special rectilinear congruences. (English) Zbl 0880.53006 Tsagas, Grigorios T. (ed.), New frontiers in algebras, groups and geometries. Proceedings of the international workshop, Molise, Italy, August 9–12, 1995. Palm Harbor, FL: Hadronic Press. Series on New Frontiers in Advanced Mathematics. 317-326 (1996). Reviewer: F.Manhart (Wien) MSC: 53A05 53-04 PDFBibTeX XMLCite \textit{Gr. Tsagas} et al., in: New frontiers in algebras, groups and geometries. Proceedings of the international workshop, Molise, Italy, August 9--12, 1995. Palm Harbor, FL: Hadronic Press. 317--326 (1996; Zbl 0880.53006)
Tsagas, Gr.; Agrafiotou, X. Special nilpotent Lie algebras. (English) Zbl 0887.17005 Tsagas, Grigorios T. (ed.), New frontiers in algebras, groups and geometries. Proceedings of the international workshop, Molise, Italy, August 9–12, 1995. Palm Harbor, FL: Hadronic Press. Series on New Frontiers in Advanced Mathematics. 139-153 (1996). Reviewer: M.Boral (Adana) MSC: 17B30 17B67 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{X. Agrafiotou}, in: New frontiers in algebras, groups and geometries. Proceedings of the international workshop, Molise, Italy, August 9--12, 1995. Palm Harbor, FL: Hadronic Press. 139--153 (1996; Zbl 0887.17005)
Tsagas, Gr. Special structures on a manifold. (English) Zbl 0832.53038 J. Inst. Math. Comput. Sci., Math. Ser. 8, No. 1, 11-17 (1995). Reviewer: O.Kowalski (Praha) MSC: 53C30 53C35 PDFBibTeX XMLCite \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 8, No. 1, 11--17 (1995; Zbl 0832.53038)
Tsagas, Gr. Spectrum of the Laplace operator for symmetric manifolds and determination of \((G_ 2,g_ 0)\). (English) Zbl 0872.58063 An. Științ. Univ. “Ovidius” Constanța, Ser. Mat. 3, No. 2, 143-152 (1995). Reviewer: G.E.Karadzhov (Sofia) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, An. Științ. Univ. ``Ovidius'' Constanța, Ser. Mat. 3, No. 2, 143--152 (1995; Zbl 0872.58063)
Tsagas, G. The spectrum of the Laplace operator for a Riemannian manifold. (English) Zbl 0805.53038 J. Inst. Math. Comput. Sci., Math. Ser. 7, No. 1, 11-16 (1994). Reviewer: P.Gilkey (Eugene) MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{G. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 7, No. 1, 11--16 (1994; Zbl 0805.53038)
Tsagas, Gr. Special structures on a manifold. (English) Zbl 0855.53017 Sci. Bull., Politeh. Univ. Buchar., Ser. A 55, No. 3-4, 239-246 (1993). MSC: 53C15 53C25 53C30 PDFBibTeX XMLCite \textit{Gr. Tsagas}, Sci. Bull., Politeh. Univ. Buchar., Ser. A 55, No. 3--4, 239--246 (1993; Zbl 0855.53017)
Tsagas, G. The spectrum of the Laplace operator for a Riemannian manifold. (English) Zbl 0808.53040 J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 2, 167-172 (1993). Reviewer: M.Puta (Timişoara) MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{G. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 2, 167--172 (1993; Zbl 0808.53040)
Kobotis, A.; Tsagas, Gr. The invariants of special nilpotent Lie algebras of dimension nine. (English) Zbl 0838.17005 J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 2, 95-103 (1993). Reviewer: M.Boral (Adana) MSC: 17B30 17B05 PDFBibTeX XMLCite \textit{A. Kobotis} and \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 2, 95--103 (1993; Zbl 0838.17005)
Tsagas, Gr.; Kobotis, A. Decomposition of the Heisenberg Lie algebra. (English) Zbl 0823.17027 J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 3, 193-196 (1993). Reviewer: M.Boral (Adana) MSC: 17B65 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 3, 193--196 (1993; Zbl 0823.17027)
Dimou, G.; Tsagas, Gr. Convex cones and skeletons of dimension fourteen. (English) Zbl 0801.32014 J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 1, 51-58 (1993). MSC: 32M99 PDFBibTeX XMLCite \textit{G. Dimou} and \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 1, 51--58 (1993; Zbl 0801.32014)
Tsagas, Gr.; Dimou, G. The spectrum of the Laplace operator and some basic properties for a Dold manifold. (English) Zbl 0808.53041 J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 1, 1-9 (1993). Reviewer: M.Puta (Timişoara) MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, J. Inst. Math. Comput. Sci., Math. Ser. 6, No. 1, 1--9 (1993; Zbl 0808.53041)
Tsagas, Gr.; Christophoridou, Cr. The cup length of a special flag manifold related to the closed geodesics of another manifold. (English) Zbl 0852.57032 J. Inst. Math. Comput. Sci., Math. Ser. 5, No. 2, 147-156 (1992). Reviewer: J.C.Thomas (Angers) MSC: 57T15 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Cr. Christophoridou}, J. Inst. Math. Comput. Sci., Math. Ser. 5, No. 2, 147--156 (1992; Zbl 0852.57032)
Tsagas, Gr.; Dimou, G. The spectrum of the Laplace operator for a generalized Dold manifold. (English) Zbl 0764.53041 Tamkang J. Math. 23, No. 1, 1-9 (1992). Reviewer: P.Gilkey (Eugene) MSC: 53C30 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, Tamkang J. Math. 23, No. 1, 1--9 (1992; Zbl 0764.53041)
Tsagas, Gr.; Kobotis, A. Characteristic elements of a category of nilpotent Lie algebras of dimension eight. (English) Zbl 0780.17007 Algebras Groups Geom. 9, No. 3, 137-256 (1992). Reviewer: M.Boral (Adana) MSC: 17B30 17B05 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Algebras Groups Geom. 9, No. 3, 137--256 (1992; Zbl 0780.17007)
Tsagas, Gr.; Dimou, G. New representation of a special non-symmetric homogeneous domain in \({\mathbb{C}{}}^ n, n{\geq{}}6\). (English) Zbl 0779.32028 Tamkang J. Math. 23, No. 3, 239-246 (1992). Reviewer: J.Dorfmeister (Lawrence) MSC: 32M10 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, Tamkang J. Math. 23, No. 3, 239--246 (1992; Zbl 0779.32028)
Tsagas, Gr.; Dimou, G. The influence of the spectrum of the Laplace operator on the symmetric structure on a manifold. (English) Zbl 0767.53032 Algebras Groups Geom. 9, No. 2, 99-109 (1992). Reviewer: P.Gilkey (Eugene) MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, Algebras Groups Geom. 9, No. 2, 99--109 (1992; Zbl 0767.53032)
Tsagas, Gr.; Dimou, G. New representation of the non-symmetric homogeneous bounded domains in \(\mathbb{C}^ 4\) and \(\mathbb{C}^ 5\). (English) Zbl 0811.32028 Int. J. Math. Math. Sci. 15, No. 4, 741-752 (1992). MSC: 32M99 17B30 53C55 17C50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, Int. J. Math. Math. Sci. 15, No. 4, 741--752 (1992; Zbl 0811.32028) Full Text: DOI EuDML
Tsagas, Gr. The spectral geometry of symmetric manifolds. (English) Zbl 0774.53024 Geometry, Proc. 3rd Congr., Thessaloniki/Greece 1991, 422-426 (1992). Reviewer: P.Gilkey (Eugene) MSC: 53C35 53C25 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, in: Proceedings of the 3rd congress on geometry, Thessaloniki, Greece, May 26-June 1st, 1991. Thessaloniki (Greece): Aristoteles University, Department of Mathematics, Section of Geometry. 422--426 (1992; Zbl 0774.53024)
Tsagas, Gr.; Kobotis, A. Classification of special nilpotent Lie algebras of dimension nine and their invariants. (English) Zbl 0757.17008 Tensor, New Ser. 50, No. 1, 51-54 (1991). Reviewer: M.Boral (Adana) MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Tensor, New Ser. 50, No. 1, 51--54 (1991; Zbl 0757.17008)
Tsagas, Gr. The spectrum of the Hopf fibration. (English) Zbl 0787.58007 Tensor, New Ser. 50, No. 1, 1-5 (1991). Reviewer: C.Bär (Bonn) MSC: 58C40 PDFBibTeX XMLCite \textit{Gr. Tsagas}, Tensor, New Ser. 50, No. 1, 1--5 (1991; Zbl 0787.58007)
Tsagas, Gr.; Dimou, G. The influence of the spectrum of the Dirac operator on the geometry of a Riemannian manifold. (English) Zbl 0844.53031 J. Inst. Math. Comput. Sci., Math. Ser. 3, No. 2, 185-199 (1990). MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{G. Dimou}, J. Inst. Math. Comput. Sci., Math. Ser. 3, No. 2, 185--199 (1990; Zbl 0844.53031)
Kobotis, A.; Tsagas, Gr. Invariants of nilpotent Lie algebras of dimension eight. (English) Zbl 0860.17010 J. Inst. Math. Comput. Sci., Math. Ser. 3, No. 3, 345-356 (1990). MSC: 17B30 PDFBibTeX XMLCite \textit{A. Kobotis} and \textit{Gr. Tsagas}, J. Inst. Math. Comput. Sci., Math. Ser. 3, No. 3, 345--356 (1990; Zbl 0860.17010)
Tsagas, Gr. The spectrum of the Hopf fibration. (English) Zbl 0776.53029 Rend. Ist. Mat. Univ. Trieste 22, No. 1-2, 28-35 (1990). MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, Rend. Ist. Mat. Univ. Trieste 22, No. 1--2, 28--35 (1990; Zbl 0776.53029)
Tsagas, Gr.; Kobotis, A. Special class of nilpotent Lie algebras. (English) Zbl 0703.17006 Bull. Calcutta Math. Soc. 81, No. 4, 327-341 (1989). Reviewer: Th.Farmer MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Bull. Calcutta Math. Soc. 81, No. 4, 327--341 (1989; Zbl 0703.17006)
Tsagas, Gr.; Xenos, Ph. Homogeneous manifolds of order four. (English) Zbl 0693.53018 Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 33(81), No. 2, 153-171 (1989). Reviewer: A.Morimoto MSC: 53C30 53C25 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ph. Xenos}, Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 33(81), No. 2, 153--171 (1989; Zbl 0693.53018)
Tsagas, Gr.; Kobotis, A. The spectrum of one parameter family of operators on the 2-forms on a compact Riemannian manifold. (English) Zbl 0683.53042 Rend. Circ. Mat. Palermo, II. Ser. 38, No. 2, 191-211 (1989). Reviewer: P.Gilkey MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Rend. Circ. Mat. Palermo (2) 38, No. 2, 191--211 (1989; Zbl 0683.53042) Full Text: DOI
Tsagas, Gr. The spectrum of the Laplace operator for the manifold \(S^{2n-1}\times S^{2m-1}/\Gamma\). (English) Zbl 0853.58109 Rend. Ist. Mat. Univ. Trieste 21, No. 2, 145-159 (1989). Reviewer: J.Tysk (MR 93a:58169) MSC: 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas}, Rend. Ist. Mat. Univ. Trieste 21, No. 2, 145--159 (1989; Zbl 0853.58109)
Tsagas, Gr.; Tsouros, K. The spectrum of the Laplace operator on \(q\)-forms of a Kähler manifold. (English) Zbl 0844.53045 J. Inst. Math. Comput. Sci., Math. Ser. 1, No. 1, 1-17 (1988). MSC: 53C55 58J50 53-04 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{K. Tsouros}, J. Inst. Math. Comput. Sci., Math. Ser. 1, No. 1, 1--17 (1988; Zbl 0844.53045)
Tsagas, Gr.; Papantoniou, B. J. On the rectilinear congruences of Lorentz manifold establishing an area preserving representation. (English) Zbl 0678.53014 Tensor, New Ser. 47, No. 2, 127-139 (1988). Reviewer: G.Stamou (Thessaloniki) MSC: 53A25 53B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{B. J. Papantoniou}, Tensor, New Ser. 47, No. 2, 127--139 (1988; Zbl 0678.53014)
Tsagas, Gr.; Kobotis, A. Classification of special nilpotent Lie algebras of dimension eight and their invariants. (English) Zbl 0675.17003 Tensor, New Ser. 47, No. 2, 116-118 (1988). Reviewer: G.Brown MSC: 17B30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{A. Kobotis}, Tensor, New Ser. 47, No. 2, 116--118 (1988; Zbl 0675.17003)
Tsagas, Gr. Special connections on the real flag manifold. (English) Zbl 0652.53034 Geometry, Proc. Congr., Thessaloniki/Greece 1987, 211-221 (1988). Reviewer: V.Boju MSC: 53C30 53B15 PDFBibTeX XML
Tsagas, Gr. Some properties of the normal bundle of a special surface. (English) Zbl 0685.53007 Tensor, New Ser. 46, 23-28 (1987). Reviewer: T.Hasanis MSC: 53A05 PDFBibTeX XMLCite \textit{Gr. Tsagas}, Tensor, New Ser. 46, 23--28 (1987; Zbl 0685.53007)
Tsagas, Gr.; Xenos, Ph. J. Riemannian structures on symmetric spaces of order five. (English) Zbl 0641.53054 Bull. Calcutta Math. Soc. 79, No. 4, 201-206 (1987). Reviewer: A.Bucki MSC: 53C35 53C30 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{Ph. J. Xenos}, Bull. Calcutta Math. Soc. 79, No. 4, 201--206 (1987; Zbl 0641.53054)
Tsagas, Gr.; Tsouros, K. The spectrum of the Laplace operator on q-forms of a Kähler manifold. (English) Zbl 0625.53044 Indian J. Pure Appl. Math. 18, 611-624 (1987). Reviewer: P.Gilkey MSC: 53C20 58J50 PDFBibTeX XMLCite \textit{Gr. Tsagas} and \textit{K. Tsouros}, Indian J. Pure Appl. Math. 18, 611--624 (1987; Zbl 0625.53044)