Duggal, K. L. Almost Ricci solitons and physical applications. (English) Zbl 06813354 Int. Electron. J. Geom. 10, No. 2, 1-10 (2017). MSC: 53C44 53C80 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. Electron. J. Geom. 10, No. 2, 1--10 (2017; Zbl 06813354) Full Text: Link
Duggal, K. L. A new class of almost Ricci solitons and their physical interpretation. (English) Zbl 1428.83010 Int. Sch. Res. Not., Math. Phys. 2016, Article ID 4903520, 6 p. (2016). MSC: 83C55 35C08 53E20 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. Sch. Res. Not., Math. Phys. 2016, Article ID 4903520, 6 p. (2016; Zbl 1428.83010) Full Text: DOI
Duggal, K. L. Generalized Robertson-Walker space-time admitting evolving null horizons related to a black hole event horizon. (English) Zbl 1428.83011 Int. Sch. Res. Not., Math. Phys. 2016, Article ID 9312525, 6 p. (2016). MSC: 83C57 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. Sch. Res. Not., Math. Phys. 2016, Article ID 9312525, 6 p. (2016; Zbl 1428.83011) Full Text: DOI
Duggal, Krishan L. Lorentzian geometry and CR-submanifolds. (English) Zbl 1351.32066 Dragomir, Sorin (ed.) et al., Geometry of Cauchy-Riemann submanifolds. Singapore: Springer (ISBN 978-981-10-0915-0/hbk; 978-981-10-0916-7/ebook). 151-177 (2016). MSC: 32V99 53C50 53C55 83C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, in: Geometry of Cauchy-Riemann submanifolds. Singapore: Springer. 151--177 (2016; Zbl 1351.32066) Full Text: DOI
Duggal, K. L. Time-dependent evolving null horizons of a dynamical spacetime. (English) Zbl 1392.83043 ISRN Math. Phys. 2014, Article ID 291790, 10 p. (2014). MSC: 83C57 53C80 PDF BibTeX XML Cite \textit{K. L. Duggal}, ISRN Math. Phys. 2014, Article ID 291790, 10 p. (2014; Zbl 1392.83043) Full Text: DOI
Duggal, K. L. A review on unique existence theorems in lightlike geometry. (English) Zbl 1347.53002 Geometry 2014, Article ID 835394, 17 p. (2014). MSC: 53-02 53C05 53C40 53B30 PDF BibTeX XML Cite \textit{K. L. Duggal}, Geometry 2014, Article ID 835394, 17 p. (2014; Zbl 1347.53002) Full Text: DOI
Duggal, K. L.; Jin, D. J. Generic lightlike submanifolds of an indefinite Sasakian manifold. (English) Zbl 1308.53084 Int. Electron. J. Geom. 5, No. 1, 108-119 (2012). MSC: 53C40 53C25 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{D. J. Jin}, Int. Electron. J. Geom. 5, No. 1, 108--119 (2012; Zbl 1308.53084) Full Text: Link
Duggal, Krishan L. Foliations of lightlike hypersurfaces and their physical interpretation. (English) Zbl 1259.53017 Cent. Eur. J. Math. 10, No. 5, 1789-1800 (2012). MSC: 53B25 53B30 53C50 53C80 83C57 PDF BibTeX XML Cite \textit{K. L. Duggal}, Cent. Eur. J. Math. 10, No. 5, 1789--1800 (2012; Zbl 1259.53017) Full Text: DOI
Duggal, K. L. A review on metric symmetries used in geometry and physics. (English) Zbl 1243.53003 ISRN Geom. 2012, Article ID 983403, 26 p. (2012). MSC: 53-02 53C50 53C80 83C15 PDF BibTeX XML Cite \textit{K. L. Duggal}, ISRN Geom. 2012, Article ID 983403, 26 p. (2012; Zbl 1243.53003) Full Text: DOI
Duggal, K. L.; Jin, D. H. A classification of Einstein lightlike hypersurfaces of a Lorentzian space form. (English) Zbl 1207.53064 J. Geom. Phys. 60, No. 12, 1881-1889 (2010). Reviewer: Marco Modugno (Firenze) MSC: 53C40 53C25 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{D. H. Jin}, J. Geom. Phys. 60, No. 12, 1881--1889 (2010; Zbl 1207.53064) Full Text: DOI
Duggal, Krishan L.; Sharma, Ramesh Solutions of Einstein’s equations with conformal Killing vector fields and initial data. (English) Zbl 1208.83034 Nonlinear Stud. 17, No. 1, 37-46 (2010). Reviewer: Alena Pravdová (Praha) MSC: 83C20 83C05 53Z05 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Nonlinear Stud. 17, No. 1, 37--46 (2010; Zbl 1208.83034)
Duggal, Krishan L.; Sahin, Bayram Differential geometry of light-like submanifolds. (English) Zbl 1187.53001 Frontiers in Mathematics. Basel: Birkhäuser (ISBN 978-3-0346-0250-1/pbk). xii, 474 p. (2010). Reviewer: Constantin Călin (Iaşi) MSC: 53-02 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Differential geometry of light-like submanifolds. Basel: Birkhäuser (2010; Zbl 1187.53001)
Sharma, Ramesh; Duggal, Krishan L. Solutions of Einstein’s equations with conformal symmetries and a contact slice. (English) Zbl 1238.53051 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 71, No. 12, e-Suppl., e701-e705 (2009). MSC: 53C50 83C15 83C20 PDF BibTeX XML Cite \textit{R. Sharma} and \textit{K. L. Duggal}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 71, No. 12, e701--e705 (2009; Zbl 1238.53051) Full Text: DOI
Duggal, K. L.; Sahin, B. Generalized Cauchy-Riemann lightlike submanifolds of indefinite Sasakian manifolds. (English) Zbl 1265.53039 Acta Math. Hung. 122, No. 1-2, 45-58 (2009). MSC: 53C15 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Acta Math. Hung. 122, No. 1--2, 45--58 (2009; Zbl 1265.53039) Full Text: DOI
Atindogbe, Cyriaque; Duggal, Krishan L. Pseudo-Jacobi operators and Osserman lightlike hypersurfaces. (English) Zbl 1173.53013 Kodai Math. J. 32, No. 1, 91-108 (2009). Reviewer: Johannes Viktor Feitzinger (Bochum) MSC: 53B30 53B50 PDF BibTeX XML Cite \textit{C. Atindogbe} and \textit{K. L. Duggal}, Kodai Math. J. 32, No. 1, 91--108 (2009; Zbl 1173.53013) Full Text: DOI
Dragomir, Sorin; Duggal, Krishan L. Indefinite extrinsic spheres. (English) Zbl 1166.53013 Tsukuba J. Math. 32, No. 2, 335-348 (2008). Reviewer: Marco Modugno (Firenze) MSC: 53B30 53C56 PDF BibTeX XML Cite \textit{S. Dragomir} and \textit{K. L. Duggal}, Tsukuba J. Math. 32, No. 2, 335--348 (2008; Zbl 1166.53013) Full Text: DOI
Duggal, K. L. Time-dependent black hole horizons on spacetime solutions of Einstein’s equations with initial data. (English) Zbl 1161.83003 Plaue, M. (ed.) et al., Advances in Lorentzian geometry. Aachen: Shaker Verlag (ISBN 978-3-8322-7786-4/pbk). 51-61 (2008). Reviewer: Hans-Jürgen Schmidt (Potsdam) MSC: 83C05 83C57 53C50 83C75 PDF BibTeX XML Cite \textit{K. L. Duggal}, in: Advances in Lorentzian geometry. Aachen: Shaker Verlag. 51--61 (2008; Zbl 1161.83003)
Duggal, K. L.; Sahin, B. Erratum to: Screen Cauchy-Riemann lightlike submanifolds. (English) Zbl 1237.53072 Acta Math. Hung. 118, No. 1-2, 197 (2008). MSC: 53C50 53C15 53C40 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Acta Math. Hung. 118, No. 1--2, 197 (2008; Zbl 1237.53072) Full Text: DOI
Duggal, Krishan Lal On existence of canonical screens for coisotropic submanifolds. (English) Zbl 1136.53014 Int. Electron. J. Geom. 1, No. 1, 25-32 (2008). MSC: 53B25 53C50 53B50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. Electron. J. Geom. 1, No. 1, 25--32 (2008; Zbl 1136.53014)
Duggal, K. L.; Sharma, R. Conformal evolution of spacetime solutions of Einstein’s equations. (English) Zbl 1168.53035 Commun. Appl. Anal. 11, No. 1, 17-25 (2007). Reviewer: Constantin Udrişte (Bucureşti) MSC: 53C50 53C80 83C15 83C40 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Commun. Appl. Anal. 11, No. 1, 17--25 (2007; Zbl 1168.53035)
Duggal, K. L. On canonical screen for lightlike submanifolds of codimension two. (English) Zbl 1153.53016 Cent. Eur. J. Math. 5, No. 4, 710-719 (2007). Reviewer: Constantin Călin (Iaşi) MSC: 53B25 53C50 53B50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Cent. Eur. J. Math. 5, No. 4, 710--719 (2007; Zbl 1153.53016) Full Text: DOI
Duggal, K. L.; Sahin, B. Lightlike submanifolds of indefinite Sasakian manifolds. (English) Zbl 1147.53044 Int. J. Math. Math. Sci. 2007, Article ID 57585, 21 p. (2007). Reviewer: Meng-Kiat Chuah (Hsinchu) MSC: 53C40 53C50 53C25 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Int. J. Math. Math. Sci. 2007, Article ID 57585, 21 p. (2007; Zbl 1147.53044) Full Text: DOI EuDML
Duggal, Krishan L.; Jin, Dae Ho Null curves and hypersurfaces of semi-Riemannian manifolds. (English) Zbl 1144.53002 Hackensack, NJ: World Scientific (ISBN 978-981-270-647-8/hbk). viii, 293 p. (2007). Reviewer: Alexander A. Borisenko (Khar’kov) MSC: 53-02 53C50 53C40 53C42 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{D. H. Jin}, Null curves and hypersurfaces of semi-Riemannian manifolds. Hackensack, NJ: World Scientific (2007; Zbl 1144.53002)
Barletta, Elisabetta; Dragomir, Sorin; Duggal, Krishan L. Foliations in Cauchy-Riemann geometry. (English) Zbl 1122.53015 Mathematical Surveys and Monographs 140. Providence, RI: American Mathematical Society (AMS) (ISBN 978-0-8218-4304-8/hbk). x, 256 p. (2007). Reviewer: Andrzej Piatkowski (Łódź) MSC: 53C12 53-02 32-02 53C50 32T15 32V05 32V15 32V20 32V30 PDF BibTeX XML Cite \textit{E. Barletta} et al., Foliations in Cauchy-Riemann geometry. Providence, RI: American Mathematical Society (AMS) (2007; Zbl 1122.53015)
Dragomir, Sorin; Duggal, Krishan L. Indefinite locally conformal Kähler manifolds. (English) Zbl 1121.53015 Differ. Geom. Appl. 25, No. 1, 8-22 (2007). Reviewer: Iulia Hirică (Bucureşti) MSC: 53B30 53B25 53B35 53C50 53C55 PDF BibTeX XML Cite \textit{S. Dragomir} and \textit{K. L. Duggal}, Differ. Geom. Appl. 25, No. 1, 8--22 (2007; Zbl 1121.53015) Full Text: DOI arXiv
Duggal, K. L. A report on canonical null curves and screen distributions for lightlike geometry. (English) Zbl 1117.53019 Acta Appl. Math. 95, No. 2, 135-149 (2007). Reviewer: R. Iordanescu (Bucureşti) MSC: 53B25 53C50 53B50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Acta Appl. Math. 95, No. 2, 135--149 (2007; Zbl 1117.53019) Full Text: DOI
Duggal, K. L. On scalar curvature in light-like geometry. (English) Zbl 1107.53047 J. Geom. Phys. 57, No. 2, 473-481 (2007). MSC: 53C50 53C20 53B50 PDF BibTeX XML Cite \textit{K. L. Duggal}, J. Geom. Phys. 57, No. 2, 473--481 (2007; Zbl 1107.53047) Full Text: DOI
Duggal, K. L.; Sahin, B. Generalized Cauchy-Riemann lightlike submanifolds of Kaehler manifolds. (English) Zbl 1121.53022 Acta Math. Hung. 112, No. 1-2, 107-130 (2006). Reviewer: Andreas Cap (Wien) MSC: 53C15 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Acta Math. Hung. 112, No. 1--2, 107--130 (2006; Zbl 1121.53022) Full Text: DOI
Duggal, Krishan L.; Sharma, Ramesh Conformal Killing vector fields on spacetime solutions of Einstein’s equations and initial data. (English) Zbl 1159.53329 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 63, No. 5-7, e447-e454 (2005). MSC: 53C40 53C25 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 63, No. 5--7, e447--e454 (2005; Zbl 1159.53329) Full Text: DOI
Duggal, K. L.; Sahin, B. Screen Cauchy Riemann lightlike submanifolds. (English) Zbl 1083.53063 Acta Math. Hung. 106, No. 1-2, 137-165 (2005); erratum ibid. 118, No. 1-2, 197 (2008). Reviewer: Adrian Sandovici (Groningen) MSC: 53C50 53C15 53C40 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Acta Math. Hung. 106, No. 1--2, 137--165 (2005; Zbl 1083.53063) Full Text: DOI
Duggal, K. L.; Giménez, A. Lightlike hypersurfaces of Lorentzian manifolds with distinguished screen. (English) Zbl 1111.53029 J. Geom. Phys. 55, No. 1, 107-122 (2005). MSC: 53C50 83C40 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{A. Giménez}, J. Geom. Phys. 55, No. 1, 107--122 (2005; Zbl 1111.53029) Full Text: DOI
Bejan, C. L.; Duggal, K. L. Global light-like manifolds and harmonicity. (English) Zbl 1084.53058 Kodai Math. J. 28, No. 1, 131-145 (2005). Reviewer: Li Haizhong (Beijing) MSC: 53C50 53C40 PDF BibTeX XML Cite \textit{C. L. Bejan} and \textit{K. L. Duggal}, Kodai Math. J. 28, No. 1, 131--145 (2005; Zbl 1084.53058) Full Text: DOI
Duggal, K. L.; Sahin, B. Screen conformal half-lightlike submanifolds. (English) Zbl 1071.53041 Int. J. Math. Math. Sci. 2004, No. 65-68, 3737-3753 (2004). MSC: 53C50 53B25 53C42 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{B. Sahin}, Int. J. Math. Math. Sci. 2004, No. 65--68, 3737--3753 (2004; Zbl 1071.53041) Full Text: DOI EuDML
Atindogbe, C.; Duggal, K. L. Conformal screen on lightlike hypersurfaces. (English) Zbl 1057.53051 Int. J. Pure Appl. Math. 11, No. 4, 421-442 (2004). Reviewer: Ruth Kellerhals (Fribourg) MSC: 53C50 53C20 83C40 PDF BibTeX XML Cite \textit{C. Atindogbe} and \textit{K. L. Duggal}, Int. J. Pure Appl. Math. 11, No. 4, 421--442 (2004; Zbl 1057.53051)
Duggal, K. L. Harmonic maps, morphisms and globally null manifolds. (English) Zbl 1059.53050 Int. J. Pure Appl. Math. 6, No. 4, 421-438 (2003). Reviewer: Andreas Gastel (Düsseldorf) MSC: 53C43 58E20 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. J. Pure Appl. Math. 6, No. 4, 421--438 (2003; Zbl 1059.53050)
Duggal, Krishan L. (ed.); Sharma, Ramesh (ed.) Recent advances in Riemannian and Lorentzian geometries. Proceedings of the special session of the annual meeting of the American Mathematical Society, Baltimore, MD, USA, January 15–18, 2003. (English) Zbl 1029.00028 Contemporary Mathematics. 337. Providence, RI: American Mathematical Society (AMS). vii, 202 p. (2003). MSC: 00B25 53-06 83-06 PDF BibTeX XML Cite \textit{K. L. Duggal} (ed.) and \textit{R. Sharma} (ed.), Recent advances in Riemannian and Lorentzian geometries. Proceedings of the special session of the annual meeting of the American Mathematical Society, Baltimore, MD, USA, January 15--18, 2003. Providence, RI: American Mathematical Society (AMS) (2003; Zbl 1029.00028) Full Text: DOI
Duggal, K. L.; Jin, D. H. Totally umbilical lightlike submanifolds. (English) Zbl 1049.53011 Kodai Math. J. 26, No. 1, 49-68 (2003). Reviewer: Marian Hotloś (Wrocław) MSC: 53B25 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{D. H. Jin}, Kodai Math. J. 26, No. 1, 49--68 (2003; Zbl 1049.53011) Full Text: DOI
Duggal, K. L. Riemannian geometry of half lightlike manifolds. (English) Zbl 1048.53053 Math. J. Toyama Univ. 25, 165-179 (2002). Reviewer: Cihan Ozgur (Balikesir) MSC: 53C50 53C20 PDF BibTeX XML Cite \textit{K. L. Duggal}, Math. J. Toyama Univ. 25, 165--179 (2002; Zbl 1048.53053)
Duggal, K. L. Constant scalar curvature and warped product globally null manifolds. (English) Zbl 1025.53040 J. Geom. Phys. 43, No. 4, 327-340 (2002). Reviewer: Pawel Walczak (Dijon) MSC: 53C50 53B30 53C20 PDF BibTeX XML Cite \textit{K. L. Duggal}, J. Geom. Phys. 43, No. 4, 327--340 (2002; Zbl 1025.53040) Full Text: DOI
Duggal, Krishan L.; Sharma, Ramesh Comment. (English) Zbl 1021.53045 Gen. Relativ. Gravitation 34, No. 8, 1325-1326 (2002). MSC: 53C50 83C05 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Gen. Relativ. Gravitation 34, No. 8, 1325--1326 (2002; Zbl 1021.53045) Full Text: DOI
Duggal, K. L. Null curves and 2-surfaces of globally null manifolds. (English) Zbl 1013.53048 Int. J. Pure Appl. Math. 1, No. 4, 389-415 (2002). Reviewer: Antonio Masiello (Bari) MSC: 53C50 53C40 53C20 83C40 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. J. Pure Appl. Math. 1, No. 4, 389--415 (2002; Zbl 1013.53048)
Duggal, Krishan L. Warped product of lightlike manifolds. (English) Zbl 1042.53518 Nonlinear Anal., Theory Methods Appl. 47, No. 5, 3061-3072 (2001). MSC: 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 47, No. 5, 3061--3072 (2001; Zbl 1042.53518) Full Text: DOI
Duggal, K. L.; Ianus, S.; Pastore, A. M. Maps interchanging \(f\)-structures and their harmonicity. (English) Zbl 1030.53048 Acta Appl. Math. 67, No. 1, 91-115 (2001). Reviewer: Neculai Papaghiuc (Iaşi) MSC: 53C25 58E20 53C43 53D15 PDF BibTeX XML Cite \textit{K. L. Duggal} et al., Acta Appl. Math. 67, No. 1, 91--115 (2001; Zbl 1030.53048) Full Text: DOI
Duggal, K. L.; Jin, D. H. Half lightlike submanifolds of codimension 2. (English) Zbl 0995.53051 Math. J. Toyama Univ. 22, 121-161 (1999). Reviewer: Ion Mihai (Bucureşti) MSC: 53C50 53B30 53B25 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{D. H. Jin}, Math. J. Toyama Univ. 22, 121--161 (1999; Zbl 0995.53051)
Duggal, K. L.; Jin, D. H. Geometry of null curves. (English) Zbl 0956.53015 Math. J. Toyama Univ. 22, 95-120 (1999). Reviewer: E.García-Río (Santiago de Compostela) MSC: 53B25 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{D. H. Jin}, Math. J. Toyama Univ. 22, 95--120 (1999; Zbl 0956.53015)
Duggal, Krishan L.; Sharma, Ramesh Symmetries of spacetimes and Riemannian manifolds. (English) Zbl 0962.53003 Mathematics and its Applications (Dordrecht). 487. Dordrecht: Kluwer Academic Publishers. x, 214 p. (1999). Reviewer: G.S.Hall (Aberdeen) MSC: 53-02 83-02 53C50 53C80 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Symmetries of spacetimes and Riemannian manifolds. Dordrecht: Kluwer Academic Publishers (1999; Zbl 0962.53003)
Duggal, Krishan L.; Bejancu, Aurel Lightlike submanifolds of semi-Riemannian manifolds and applications. (English) Zbl 0848.53001 Mathematics and its Applications (Dordrecht). 364. Dordrecht: Kluwer Academic Publishers. viii, 300 p. Dfl. 225.00; $ 158.00; £99.00 (1996). Reviewer: V.V.Goldberg (Newark / New Jersey) MSC: 53-02 53B25 53B30 53Z05 83-02 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{A. Bejancu}, Lightlike submanifolds of semi-Riemannian manifolds and applications. Dordrecht: Kluwer Academic Publishers (1996; Zbl 0848.53001)
Duggal, K. L.; Asgekar, G. G.; Aherkar, S. M. A class of shear-free, non-static models for anisotropic magnetofluid systems. (English) Zbl 0843.76101 J. Math. Phys. 36, No. 6, 2929-2940 (1995). MSC: 76Y05 76W05 PDF BibTeX XML Cite \textit{K. L. Duggal} et al., J. Math. Phys. 36, No. 6, 2929--2940 (1995; Zbl 0843.76101) Full Text: DOI
Bejancu, Aurel; Duggal, K. L. Lightlike submanifolds of semi-Riemannian manifolds. (English) Zbl 0831.53040 Acta Appl. Math. 38, No. 2, 197-215 (1995). Reviewer: B.Rouxel (Quimper) MSC: 53C42 53C50 PDF BibTeX XML Cite \textit{A. Bejancu} and \textit{K. L. Duggal}, Acta Appl. Math. 38, No. 2, 197--215 (1995; Zbl 0831.53040) Full Text: DOI
Sharma, Ramesh; Duggal, Krishan L. Ricci curvature inheriting symmetries of semi-Riemannian manifolds. (English) Zbl 0866.53012 Beem, John K. (ed.) et al., Differential geometry and mathematical physics. AMS-CMS special session on geometric methods in mathematical physics, August 15-19, 1993, Vancouver, British Columbia, Canada. Providence, RI: American Mathematical Society. Contemp. Math. 170, 215-224 (1994). Reviewer: G.S.Hall (Aberdeen) MSC: 53B30 83C20 PDF BibTeX XML Cite \textit{R. Sharma} and \textit{K. L. Duggal}, Contemp. Math. 170, 215--224 (1994; Zbl 0866.53012)
Duggal, Krishan L.; Bejancu, Aurel Spacetime geometry of CR-structures. (English) Zbl 0868.53046 Beem, John K. (ed.) et al., Differential geometry and mathematical physics. AMS-CMS special session on geometric methods in mathematical physics, August 15-19, 1993, Vancouver, British Columbia, Canada. Providence, RI: American Mathematical Society. Contemp. Math. 170, 51-63 (1994). Reviewer: B.Rouxel (Quimper) MSC: 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{A. Bejancu}, Contemp. Math. 170, 51--63 (1994; Zbl 0868.53046)
Duggal, K. L.; Ianus, S.; Pastore, A. M. Harmonic maps on \(f\)-manifolds with semi-Riemannian metrics. (English) Zbl 0841.53031 Andrica, D. (ed.) et al., Proceedings of the 23rd conference on geometry and topology, Cluj-Napoca, Romania, September 27-29, 1993. Cluj-Napoca: “Babeş-Bolyai” Univ., Fac. of Math. and Comput. Science, 47-55 (1994). Reviewer: A.Bejancu (Iaşi) MSC: 53C15 53C50 58E20 53C10 PDF BibTeX XML Cite \textit{K. L. Duggal} et al., in: Proceedings of the 23rd conference on geometry and topology, Cluj-Napoca, Romania, September 27-29, 1993. Cluj-Napoca: ``Babeş-Bolyai'' Univ., Fac. of Math. and Comput. Science. 47--55 (1994; Zbl 0841.53031)
Beem, John K. (ed.); Duggal, Krishan L. (ed.) Differential geometry and mathematical physics. AMS-CMS special session on geometric methods in mathematical physics, August 15-19, 1993, Vancouver, British Columbia, Canada. (English) Zbl 0801.00031 Contemporary Mathematics. 170. Providence, RI: American Mathematical Society (AMS). vii, 224 p. (1994). MSC: 00B25 53-06 53Z05 PDF BibTeX XML Cite \textit{J. K. Beem} (ed.) and \textit{K. L. Duggal} (ed.), Differential geometry and mathematical physics. AMS-CMS special session on geometric methods in mathematical physics, August 15-19, 1993, Vancouver, British Columbia, Canada. Providence, RI: American Mathematical Society (1994; Zbl 0801.00031) Full Text: DOI
Duggal, K. L. Symmetry inheritance in Riemannian manifolds with physical applications. (English) Zbl 0793.53065 Acta Appl. Math. 31, No. 3, 225-247 (1993). Reviewer: G.S.Hall (Aberdeen) MSC: 53C50 83C20 PDF BibTeX XML Cite \textit{K. L. Duggal}, Acta Appl. Math. 31, No. 3, 225--247 (1993; Zbl 0793.53065) Full Text: DOI
Bejancu, A.; Duggal, K. L. Real hypersurfaces of indefinite Kähler manifolds. (English) Zbl 0787.53048 Int. J. Math. Math. Sci. 16, No. 3, 545-556 (1993). Reviewer: J.Berndt (Köln) MSC: 53C40 53C50 53C25 PDF BibTeX XML Cite \textit{A. Bejancu} and \textit{K. L. Duggal}, Int. J. Math. Math. Sci. 16, No. 3, 545--556 (1993; Zbl 0787.53048) Full Text: DOI EuDML
Duggal, K. L.; Bejancu, A. Light-like \(CR\) hypersurfaces of indefinite Kähler manifolds. (English) Zbl 0782.53051 Acta Appl. Math. 31, No. 2, 171-190 (1993). MSC: 53C40 53C50 83C20 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{A. Bejancu}, Acta Appl. Math. 31, No. 2, 171--190 (1993; Zbl 0782.53051) Full Text: DOI
Duggal, K. L.; Bejancu, A. Lightlike submanifolds of codimension two. (English) Zbl 0777.53020 Math. J. Toyama Univ. 15, 59-82 (1992). Reviewer: B.Rouxel (Quimper) MSC: 53B25 53B30 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{A. Bejancu}, Math. J. Toyama Univ. 15, 59--82 (1992; Zbl 0777.53020)
Duggal, K. L. Curvature inheritance symmetry in Riemannian spaces with applications to fluid space times. (English) Zbl 0767.53054 J. Math. Phys. 33, No. 9, 2989-2997 (1992). Reviewer: D.Geißler (Hamburg) MSC: 53Z05 83C40 PDF BibTeX XML Cite \textit{K. L. Duggal}, J. Math. Phys. 33, No. 9, 2989--2997 (1992; Zbl 0767.53054) Full Text: DOI
Duggal, K. L. Affine conformal vector fields in semi-Riemannian manifolds. (English) Zbl 0734.53023 Acta Appl. Math. 23, No. 3, 275-294 (1991). Reviewer: G.S.Hall (Aberdeen) MSC: 53B99 PDF BibTeX XML Cite \textit{K. L. Duggal}, Acta Appl. Math. 23, No. 3, 275--294 (1991; Zbl 0734.53023)
Bejancu, Aurel; Duggal, K. L. Gauge theory on foliated manifolds. (English) Zbl 0813.53016 Rend. Semin. Mat. Messina, Ser. II 14, No. 1, 31-68 (1991). Reviewer: V.Yu.Rovenskij (Krasnoyarsk) MSC: 53C12 53C50 PDF BibTeX XML Cite \textit{A. Bejancu} and \textit{K. L. Duggal}, Rend. Semin. Mat. Messina, Ser. II 1, No. 14, 31--68 (1991; Zbl 0813.53016)
Bejancu, A.; Duggal, K. L.; Ianuş, S. On the Vranceanu connection. (English) Zbl 0811.53018 Proceedings of the 22nd conference on differential geometry and topology, applications in physics and technics, Polytechnic Institute of Bucharest, Romania, September 9-13, 1991. Bucharest: Polytechnic Institute of Bucharest, 39-49 (1991). Reviewer: L.Tamássy (Debrecen) MSC: 53B40 53C12 PDF BibTeX XML Cite \textit{A. Bejancu} et al., in: Proceedings of the 22nd conference on differential geometry and topology applications in physics and technics, Polytechnic Institute of Bucharest, Romania, September 9-13, 1991. Scientific Bulletin, Polytechnic Institute of Bucharest, Electrical Engineering 53, No. 3-4. Bucharest: Polytechnic Institute of Bucharest. 39--49 (1991; Zbl 0811.53018)
Bejancu, Aurel; Duggal, K. L. Degenerated hypersurfaces of semi-Riemannian manifolds. (English) Zbl 0808.53015 Bul. Inst. Politeh. Iaşi, Secţ. I 37, No. 1-4, 13-22 (1991). Reviewer: B.Rouxel (Quimper) MSC: 53B25 53B30 PDF BibTeX XML Cite \textit{A. Bejancu} and \textit{K. L. Duggal}, Bul. Inst. Politeh. Iaşi, Secţ. I 37, No. 1--4, 13--22 (1991; Zbl 0808.53015)
Duggal, K. L.; Sharma, R. Hypersurfaces in a conformally flat space with curvature collineation. (English) Zbl 0753.53034 Int. J. Math. Math. Sci. 14, No. 3, 595-604 (1991). Reviewer: B.Palmer (Berlin) MSC: 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Int. J. Math. Math. Sci. 14, No. 3, 595--604 (1991; Zbl 0753.53034) Full Text: DOI EuDML
Duggal, K. L. Lorentzian geometry of globally framed manifolds. (English) Zbl 0715.53045 Acta Appl. Math. 19, No. 2, 131-148 (1990). Reviewer: L.M.Sokolowski MSC: 53C50 53C80 83C99 PDF BibTeX XML Cite \textit{K. L. Duggal}, Acta Appl. Math. 19, No. 2, 131--148 (1990; Zbl 0715.53045)
Duggal, K. L. Space time manifolds and contact structures. (English) Zbl 0715.53032 Int. J. Math. Math. Sci. 13, No. 3, 545-554 (1990). Reviewer: D.Allison MSC: 53C15 53C50 83C99 PDF BibTeX XML Cite \textit{K. L. Duggal}, Int. J. Math. Math. Sci. 13, No. 3, 545--554 (1990; Zbl 0715.53032) Full Text: DOI EuDML
Duggal, K. L. Lorentzian geometry of CR submanifolds. (English) Zbl 0692.53025 Acta Appl. Math. 17, No. 2, 171-193 (1989). Reviewer: D.Allison MSC: 53C50 53C55 53C80 83C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Acta Appl. Math. 17, No. 2, 171--193 (1989; Zbl 0692.53025) Full Text: DOI
Duggal, K. L. Relativistic fluids and metric symmetries. (English) Zbl 0675.76123 J. Math. Phys. 30, No. 6, 1316-1322 (1989). MSC: 76Y05 83C55 83F05 PDF BibTeX XML Cite \textit{K. L. Duggal}, J. Math. Phys. 30, No. 6, 1316--1322 (1989; Zbl 0675.76123) Full Text: DOI
Duggal, K. L. Some applications of globally framed structures to relativity. (English) Zbl 0686.53028 Ann. Mat. Pura Appl., IV. Ser. 153, 77-90 (1988). Reviewer: M.de Leon MSC: 53C15 83C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Ann. Mat. Pura Appl. (4) 153, 77--90 (1988; Zbl 0686.53028) Full Text: DOI
Duggal, K. L. Some recent results on relativistic fluids with shear. (English) Zbl 0737.53068 General relativity and relativistic astrophysics, Proc. 2nd Can. Conf., Toronto/Can. 1987, 260-263 (1988). MSC: 53Z05 53B50 PDF BibTeX XML
Sharma, R.; Duggal, K. L. Totally umbilical CR-submanifolds of locally conformal Kaehler manifolds. (English) Zbl 0685.53041 Math. Chron. 16, 79-83 (1987). Reviewer: C.S.Houh MSC: 53C40 PDF BibTeX XML Cite \textit{R. Sharma} and \textit{K. L. Duggal}, Math. Chron. 16, 79--83 (1987; Zbl 0685.53041)
Sharma, R.; Duggal, K. L. Mixed foliate CR-submanifolds of indefinite complex space-forms. (English) Zbl 0652.53038 Ann. Mat. Pura Appl., IV. Ser. 149, 103-111 (1987). Reviewer: A.Bejancu MSC: 53C40 PDF BibTeX XML Cite \textit{R. Sharma} and \textit{K. L. Duggal}, Ann. Mat. Pura Appl. (4) 149, 103--111 (1987; Zbl 0652.53038) Full Text: DOI
Duggal, K. L. Relativistic fluids with shear and timelike conformal collineations. (English) Zbl 0645.76132 J. Math. Phys. 28, 2700-2704 (1987). MSC: 76Y05 83C55 83F05 PDF BibTeX XML Cite \textit{K. L. Duggal}, J. Math. Phys. 28, 2700--2704 (1987; Zbl 0645.76132) Full Text: DOI
Duggal, K. L.; Sharma, R. Totally umbilical CR-submanifolds of semi-Riemannian Kähler manifolds. (English) Zbl 0624.53030 Int. J. Math. Math. Sci. 10, 551-556 (1987). Reviewer: A.Bejancu MSC: 53C40 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Int. J. Math. Math. Sci. 10, 551--556 (1987; Zbl 0624.53030) Full Text: DOI EuDML
Duggal, K. L.; Sharma, R. Conformal collineations and anisotropic fluids in general relativity. (English) Zbl 0618.76131 J. Math. Phys. 27, 2511-2513 (1986). Reviewer: H.Brans MSC: 76Y05 83C55 83C40 83C05 53C80 58D30 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, J. Math. Phys. 27, 2511--2513 (1986; Zbl 0618.76131) Full Text: DOI
Duggal, K. L. CR-structures and Lorentzian geometry. (English) Zbl 0608.53053 Acta Appl. Math. 7, 211-223 (1986). Reviewer: A.Bejancu MSC: 53C40 53C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Acta Appl. Math. 7, 211--223 (1986; Zbl 0608.53053) Full Text: DOI
Duggal, K. L.; Sharma, R. Semi-symmetric metric connections in a semi-Riemannian manifold. (English) Zbl 0607.53012 Indian J. Pure Appl. Math. 17, 1276-1283 (1986). Reviewer: T.Okubo MSC: 53B30 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Indian J. Pure Appl. Math. 17, 1276--1283 (1986; Zbl 0607.53012)
Duggal, K. L.; Sharma, R. Lorentzian framed structures in general relativity. (English) Zbl 0581.53053 Gen. Relativ. Gravitation 18, 71-77 (1986). Reviewer: D.Geißler MSC: 53C80 83C99 53C15 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{R. Sharma}, Gen. Relativ. Gravitation 18, 71--77 (1986; Zbl 0581.53053) Full Text: DOI
Sharma, R.; Duggal, K. L. Characterization of an affine conformal vector field. (English) Zbl 0579.53020 C. R. Math. Acad. Sci., Soc. R. Can. 7, 201-205 (1985). Reviewer: Bernd Wegner MSC: 53B30 PDF BibTeX XML Cite \textit{R. Sharma} and \textit{K. L. Duggal}, C. R. Math. Acad. Sci., Soc. R. Can. 7, 201--205 (1985; Zbl 0579.53020)
Duggal, K. L.; Moskal, E. M. Geometry of almost contingent manifold of second class as applied in relativity. (English) Zbl 0546.53017 Tensor, New Ser. 40, 207-214 (1983). Reviewer: J.D.Zund MSC: 53B50 53B30 83C50 83F05 PDF BibTeX XML Cite \textit{K. L. Duggal} and \textit{E. M. Moskal}, Tensor, New Ser. 40, 207--214 (1983; Zbl 0546.53017)
Duggal, K. L. On the geometry of electromagnetic fields of second class. (English) Zbl 0513.53017 Indian J. Pure Appl. Math. 14, 455-461 (1983). MSC: 53B35 53C15 53B50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Indian J. Pure Appl. Math. 14, 455--461 (1983; Zbl 0513.53017)
Duggal, K. L. Einstein-Maxwell equations compatible with certain Killing vectors with light velocity. (English) Zbl 0413.53024 Ann. Mat. Pura Appl., IV. Ser. 120, 263-268 (1979). MSC: 53B50 83C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Ann. Mat. Pura Appl. (4) 120, 263--268 (1979; Zbl 0413.53024) Full Text: DOI
Duggal, K. L. On the four current source of the electromagnetic fields. (English) Zbl 0413.53023 Ann. Mat. Pura Appl., IV. Ser. 120, 305-313 (1979). MSC: 53B50 83C50 53B30 PDF BibTeX XML Cite \textit{K. L. Duggal}, Ann. Mat. Pura Appl. (4) 120, 305--313 (1979; Zbl 0413.53023) Full Text: DOI
Duggal, K. L. Geometry developed by the electromagnetic tensor field. (English) Zbl 0409.53023 Ann. Mat. Pura Appl., IV. Ser. 119, 239-245 (1979). MSC: 53B50 53B30 83C50 PDF BibTeX XML Cite \textit{K. L. Duggal}, Ann. Mat. Pura Appl. (4) 119, 239--245 (1979; Zbl 0409.53023) Full Text: DOI
Duggal, K. L. Existence of two Killing vector fields on the space-time of general relativity. (English) Zbl 0415.53020 Tensor, New Ser. 32, 318-322 (1978). MSC: 53B50 83C50 53B30 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 32, 318--322 (1978; Zbl 0415.53020)
Duggal, K. L. On almost contingent manifolds of second class with applications in relativity. (English) Zbl 0389.53029 Can. Math. Bull. 21, 289-295 (1978). MSC: 53C50 53C80 53C55 53C15 PDF BibTeX XML Cite \textit{K. L. Duggal}, Can. Math. Bull. 21, 289--295 (1978; Zbl 0389.53029) Full Text: DOI
Duggal, K. L. On a unified theory of differentiable structures. III: Hypersurfaces. (English) Zbl 0317.53037 Tensor, New Ser. 30, 83-86 (1976). MSC: 53C15 53C40 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 30, 83--86 (1976; Zbl 0317.53037)
Duggal, K. L. On the spheres carrying an almost contingent structure. (English) Zbl 0312.53029 Can. Math. Bull. 18, 195-201 (1975). MSC: 53C15 PDF BibTeX XML Cite \textit{K. L. Duggal}, Can. Math. Bull. 18, 195--201 (1975; Zbl 0312.53029) Full Text: DOI
Duggal, K. L. On a unified theory of differentiable structures. II: Existence theorems. (English) Zbl 0291.53017 Tensor, New Ser. 29, 209-213 (1975). MSC: 53C15 53C25 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 29, 209--213 (1975; Zbl 0291.53017)
Duggal, K. L. On a unified theory of differentiable structures. I: Almost contingent structures. (English) Zbl 0249.53023 Tensor, New Ser. 25, 303-308 (1972). MSC: 53C15 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 25, 303--308 (1972; Zbl 0249.53023)
Duggal, K. L. Generalised Hermitian structures in the broad sense. (English) Zbl 0245.53039 Prog. Math., Allahabad 5, No. 1-2, 7-19 (1971). MSC: 53C15 53C05 53C55 PDF BibTeX XML Cite \textit{K. L. Duggal}, Prog. Math., Allahabad 5, No. 1--2, 7--19 (1971; Zbl 0245.53039)
Duggal, K. L. On differentiable structures defined by algebraic equations. II: F- connections. (English) Zbl 0236.53038 Tensor, New Ser. 22, 255-260 (1971). MSC: 53C15 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 22, 255--260 (1971; Zbl 0236.53038)
Duggal, K. L. On differentiable structures defined by algebraic equations. I: Nijenhuis tensor. (English) Zbl 0236.53037 Tensor, New Ser. 22, 238-242 (1971). MSC: 53C15 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 22, 238--242 (1971; Zbl 0236.53037)
Duggal, K. L. The operators \(C^ s\) and \(M^ s\) on the \(r-\pi\)-structures. (English) Zbl 0205.26301 Tensor, New Ser. 22, 37-40 (1971). MSC: 53C99 58A99 PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 22, 37--40 (1971; Zbl 0205.26301)
Duggal, K. L. Singular Riemannian subordinate to \(r-\pi\)-structures. (English) Zbl 0181.24403 Tensor, New Ser. 21, 265-272 (1970). PDF BibTeX XML Cite \textit{K. L. Duggal}, Tensor, New Ser. 21, 265--272 (1970; Zbl 0181.24403)
Duggal, K. L. Singular Riemannian structures compatible with \(\pi\)-structures. (English) Zbl 0186.55303 Can. Math. Bull. 12, 705-719 (1969). PDF BibTeX XML Cite \textit{K. L. Duggal}, Can. Math. Bull. 12, 705--719 (1969; Zbl 0186.55303) Full Text: DOI