Ferreira, José M.; Pinelas, Sandra; Ruffing, Andreas Oscillatory difference equations and moment problems. (English) Zbl 1417.39032 Adv. Difference Equ. 2014, Paper No. 110, 16 p. (2014). MSC: 39A21 39A13 PDFBibTeX XMLCite \textit{J. M. Ferreira} et al., Adv. Difference Equ. 2014, Paper No. 110, 16 p. (2014; Zbl 1417.39032) Full Text: DOI
Birk, Lucia; Roßkopf, Sophia; Ruffing, Andreas Difference-differential operators for basic adaptive discretizations and their central function systems. (English) Zbl 1380.39023 Adv. Difference Equ. 2012, Paper No. 151, 19 p. (2012). MSC: 39A70 PDFBibTeX XMLCite \textit{L. Birk} et al., Adv. Difference Equ. 2012, Paper No. 151, 19 p. (2012; Zbl 1380.39023) Full Text: DOI
Ruffing, Andreas; Meiler, Maria; Bruder, Andrea Some basic difference equations of Schrödinger boundary value problems. (English) Zbl 1216.39008 Adv. Difference Equ. 2009, Article ID 569803, 22 p. (2009). MSC: 39A12 34N05 34L40 PDFBibTeX XMLCite \textit{A. Ruffing} et al., Adv. Difference Equ. 2009, Article ID 569803, 22 p. (2009; Zbl 1216.39008) Full Text: DOI
Ferreira, José M.; Pinelas, Sandra; Ruffing, Andreas Nonautonomous oscillators and coefficient evaluation for orthogonal function systems. (English) Zbl 1184.39004 J. Difference Equ. Appl. 15, No. 11-12, 1117-1133 (2009). Reviewer: Ahmed Hegazi (Mansoura) MSC: 39A21 33C45 PDFBibTeX XMLCite \textit{J. M. Ferreira} et al., J. Difference Equ. Appl. 15, No. 11--12, 1117--1133 (2009; Zbl 1184.39004) Full Text: DOI Link
Ruffing, Andreas; Simon, Moritz Analytic aspects of \(q\)-delayed exponentials: minimal growth, negative zeros and basic ghost states. (English) Zbl 1147.30022 J. Difference Equ. Appl. 14, No. 4, 347-366 (2008). Reviewer: Rolf Wallisser (Freiburg i. Br.) MSC: 30D15 34K06 81Q10 33D15 81R30 81V80 PDFBibTeX XMLCite \textit{A. Ruffing} and \textit{M. Simon}, J. Difference Equ. Appl. 14, No. 4, 347--366 (2008; Zbl 1147.30022) Full Text: DOI
Garbers, Nicole; Ruffing, Andreas Heim-Lorek supermodels. (English) Zbl 1141.39022 Int. J. Difference Equ. 2, No. 1, 79-91 (2007). Reviewer: Edwin Engin Yaz (Milwaukee) MSC: 39A13 39A12 81Q05 PDFBibTeX XMLCite \textit{N. Garbers} and \textit{A. Ruffing}, Int. J. Difference Equ. 2, No. 1, 79--91 (2007; Zbl 1141.39022)
Ruffing, A. (ed.); Suhrer, A. (ed.); Suhrer, J. (ed.) Communications of the Laufen colloquium on science, Laufen, Austria, April 1–5, 2007. (English) Zbl 1130.39001 Berichte aus der Mathematik. Aachen: Shaker (ISBN 978-3-8322-6739-1/pbk). not consec. pag. (2007). MSC: 39-06 00B25 PDFBibTeX XMLCite \textit{A. Ruffing} (ed.) et al., Communications of the Laufen colloquium on science, Laufen, Austria, April 1--5, 2007. Aachen: Shaker (2007; Zbl 1130.39001)
Elaydi, S. (ed.); Cushing, J. (ed.); Lasser, R. (ed.); Ruffing, A. (ed.); Papageorgiou, V. (ed.); Van Assche, W. (ed.) Difference equations, special functions and orthogonal polynomials. Proceedings of the international conference, Munich, Germany, July 25–30, 2005. (English) Zbl 1117.39001 Hackensack, NJ: World Scientific (ISBN 978-981-270-643-0/hbk). xiii, 773 p. (2007). MSC: 39-06 33-06 37-06 42-06 00B25 PDFBibTeX XMLCite \textit{S. Elaydi} (ed.) et al., Difference equations, special functions and orthogonal polynomials. Proceedings of the international conference, Munich, Germany, July 25--30, 2005. Hackensack, NJ: World Scientific (2007; Zbl 1117.39001)
Ey, Kristine; Ruffing, Andreas; Suslov, Sergei Method of separation of the variables for basic analogs of equations of mathematical physics. (English) Zbl 1121.33018 Ramanujan J. 13, No. 1-3, 407-447 (2007). Reviewer: Ajendra Nath Srivastava (Puna) MSC: 33D45 42C10 33D15 PDFBibTeX XMLCite \textit{K. Ey} et al., Ramanujan J. 13, No. 1--3, 407--447 (2007; Zbl 1121.33018) Full Text: DOI
Garbers, Nicole; Ruffing, Andreas Using supermodels in quantum optics. (English) Zbl 1139.39028 Adv. Difference Equ. 2006, Article ID 72768, 14 p. (2006). MSC: 39A12 81Q05 81Q60 81V80 PDFBibTeX XMLCite \textit{N. Garbers} and \textit{A. Ruffing}, Adv. Difference Equ. 2006, Article ID 72768, 14 p. (2006; Zbl 1139.39028) Full Text: DOI EuDML
Gilewicz, Jacek; Leopold, Elie; Ruffing, Andreas; Valent, Galliano Some cubic birth and death processes and their related orthogonal polynomials. (English) Zbl 1106.33008 Constructive Approximation 24, No. 1, 71-89 (2006). Reviewer: Aleksey A. Dovgoshey (Donetsk) MSC: 33C45 44A60 60J80 PDFBibTeX XMLCite \textit{J. Gilewicz} et al., Constr. Approx. 24, No. 1, 71--89 (2006; Zbl 1106.33008) Full Text: DOI arXiv
Simon, Moritz; Ruffing, Andreas Power series techniques for a special Schrödinger operator and related difference equations. (English) Zbl 1115.34002 Adv. Difference Equ. 2005, No. 2, 109-118 (2005). Reviewer: Vladimir L. Makarov (Kyïv) MSC: 34A05 34A25 PDFBibTeX XMLCite \textit{M. Simon} and \textit{A. Ruffing}, Adv. Difference Equ. 2005, No. 2, 109--118 (2005; Zbl 1115.34002) Full Text: DOI EuDML
Ruffing, Andreas; Simon, Moritz Corresponding Banach spaces on time scales. (English) Zbl 1074.39021 J. Comput. Appl. Math. 179, No. 1-2, 313-326 (2005). Reviewer: Roman Hilscher (Brno) MSC: 39A12 39A10 39A13 PDFBibTeX XMLCite \textit{A. Ruffing} and \textit{M. Simon}, J. Comput. Appl. Math. 179, No. 1--2, 313--326 (2005; Zbl 1074.39021) Full Text: DOI
Marquardt, Tina; Ruffing, Andreas Modifying differential representations of Hermite functions and their impact on diffusion processes and martingales. (English) Zbl 1063.60058 Dyn. Syst. Appl. 13, No. 3-4, 419-433 (2004). MSC: 60G42 42C05 39A12 39A13 33E05 60J60 35K57 PDFBibTeX XMLCite \textit{T. Marquardt} and \textit{A. Ruffing}, Dyn. Syst. Appl. 13, No. 3--4, 419--433 (2004; Zbl 1063.60058)
Ey, Kristine; Ruffing, Andreas The moment problem of discrete \(q\)-Hermite polynomials on different time scales. (English) Zbl 1077.39016 Dyn. Syst. Appl. 13, No. 3-4, 409-418 (2004). Reviewer: Dobiesław Bobrowski (Poznań) MSC: 39A12 44A60 33D45 PDFBibTeX XMLCite \textit{K. Ey} and \textit{A. Ruffing}, Dyn. Syst. Appl. 13, No. 3--4, 409--418 (2004; Zbl 1077.39016)
Ey, Kristine; Ruffing, Andreas On Rodriguez representations for discrete \(q\)-Hermite polynomials of type II. (English) Zbl 1075.33012 Dyn. Syst. Appl. 13, No. 3-4, 397-407 (2004). Reviewer: Stamatis Koumandos (Nicosia) MSC: 33D45 39A10 39A13 47B39 47B36 PDFBibTeX XMLCite \textit{K. Ey} and \textit{A. Ruffing}, Dyn. Syst. Appl. 13, No. 3--4, 397--407 (2004; Zbl 1075.33012)
Ruffing, Andreas; Simon, Moritz On some difference equations in the context of \(q\)-Fourier analysis. (English) Zbl 1065.39043 Aulbach, Bernd (ed.) et al., New progress in difference equations. Proceedings of the 6th international conference on difference equations, Augsburg, Germany July 30–August 3, 2001. Boca Raton, FL: CRC Press (ISBN 0-415-31675-8/hbk). 523-530 (2004). MSC: 39A13 33D45 42A38 PDFBibTeX XMLCite \textit{A. Ruffing} and \textit{M. Simon}, in: New progress in difference equations. Proceedings of the 6th international conference on difference equations, Augsburg, Germany July 30--August 3, 2001. Boca Raton, FL: CRC Press. 523--530 (2004; Zbl 1065.39043)
Ey, Kristine; Ruffing, Andreas Fixing the ladder operators on two types of Hermite functions. (English) Zbl 1055.39032 Dyn. Syst. Appl. 12, No. 1-2, 115-129 (2003). Reviewer: S. Ahmad Ali (Lucknow) MSC: 39A13 39A70 33D45 47B39 93C70 PDFBibTeX XMLCite \textit{K. Ey} and \textit{A. Ruffing}, Dyn. Syst. Appl. 12, No. 1--2, 115--129 (2003; Zbl 1055.39032)
Ruffing, Andreas; Lorenz, Julian; Ziegler, Konstantin Difference ladder operators for a harmonic Schrödinger oscillator using unitary linear lattices. (English) Zbl 1023.39015 J. Comput. Appl. Math. 153, No. 1-2, 395-410 (2003). Reviewer: Stefan Hilger (Eichstätt) MSC: 39A70 39A13 PDFBibTeX XMLCite \textit{A. Ruffing} et al., J. Comput. Appl. Math. 153, No. 1--2, 395--410 (2003; Zbl 1023.39015) Full Text: DOI
Ruffing, Andreas Investigating some spectral properties of two-dimensional hysteresis play-functionals. (English) Zbl 1058.47058 Open Syst. Inf. Dyn. 8, No. 4, 303-313 (2001). Reviewer: Dimitrii Rachinskii (Moskva) MSC: 47J40 47H30 PDFBibTeX XMLCite \textit{A. Ruffing}, Open Syst. Inf. Dyn. 8, No. 4, 303--313 (2001; Zbl 1058.47058) Full Text: DOI
Ruffing, Andreas; Windpassinger, Patrick; Panig, Stefan Comparing algebraic and numerical solutions of classical diffusion process equations in computational financial mathematics. (English) Zbl 1001.91050 Discrete Dyn. Nat. Soc. 6, No. 3, 159-169 (2001). MSC: 91G60 35Q91 65M06 91G20 PDFBibTeX XMLCite \textit{A. Ruffing} et al., Discrete Dyn. Nat. Soc. 6, No. 3, 159--169 (2001; Zbl 1001.91050) Full Text: DOI
Berg, Christian; Ruffing, Andreas Generalized \(q\)-Hermite polynomials. (English) Zbl 0989.81004 Commun. Math. Phys. 223, No. 1, 29-46 (2001). MSC: 81P10 33D45 81R50 47B39 33D90 PDFBibTeX XMLCite \textit{C. Berg} and \textit{A. Ruffing}, Commun. Math. Phys. 223, No. 1, 29--46 (2001; Zbl 0989.81004) Full Text: DOI
Ruffing, Andreas Differential representations of dynamical oscillator symmetries in discrete Hilbert space. (English) Zbl 1060.81539 Discrete Dyn. Nat. Soc. 5, No. 2, 97-106 (2000). MSC: 81R50 81R15 22E70 81Q05 PDFBibTeX XMLCite \textit{A. Ruffing}, Discrete Dyn. Nat. Soc. 5, No. 2, 97--106 (2000; Zbl 1060.81539) Full Text: DOI EuDML
Ruffing, Andreas On discretized generalizations of Krichever-Novikov algebras. (English) Zbl 1053.17016 Open Syst. Inf. Dyn. 7, No. 3, 237-254 (2000). Reviewer: Martin Schlichenmaier (Luxembourg) MSC: 17B66 17B68 81R10 14H52 PDFBibTeX XMLCite \textit{A. Ruffing}, Open Syst. Inf. Dyn. 7, No. 3, 237--254 (2000; Zbl 1053.17016) Full Text: DOI
Ruffing, Andreas Linking special semiconvex functions and three-term-recurrent structures. (English) Zbl 1012.49011 Open Syst. Inf. Dyn. 7, No. 3, 219-235 (2000). Reviewer: Giuseppe Buttazzo (Pisa) MSC: 49J45 52A41 42C05 PDFBibTeX XMLCite \textit{A. Ruffing}, Open Syst. Inf. Dyn. 7, No. 3, 219--235 (2000; Zbl 1012.49011) Full Text: DOI
Ruffing, Andreas Discretized representations of harmonic variables by bilateral Jacobi operators. (English) Zbl 1079.81535 Discrete Dyn. Nat. Soc. 4, No. 4, 297-308 (2000). MSC: 81R12 33D15 39A12 39A13 81Q99 PDFBibTeX XMLCite \textit{A. Ruffing}, Discrete Dyn. Nat. Soc. 4, No. 4, 297--308 (2000; Zbl 1079.81535) Full Text: DOI EuDML
Ruffing, Andreas On Schrödinger-Hermite operators in lattice quantum mechanics. (English) Zbl 0933.39046 Lett. Math. Phys. 47, No. 3, 197-214 (1999). Reviewer: Costică Moroşanu (Iaşi) MSC: 39A70 81Q05 39A13 34L40 47A10 PDFBibTeX XMLCite \textit{A. Ruffing}, Lett. Math. Phys. 47, No. 3, 197--214 (1999; Zbl 0933.39046) Full Text: DOI
Ruffing, Andreas; Witt, Myriam On the integrability of \(q\)-oscillators based on invariants of discrete Fourier transforms. (English) Zbl 0884.33011 Lett. Math. Phys. 42, No. 2, 167-181 (1997). Reviewer: J.Van der Jeugt (Gent) MSC: 33D15 81R50 46L85 46L87 81Q10 PDFBibTeX XMLCite \textit{A. Ruffing} and \textit{M. Witt}, Lett. Math. Phys. 42, No. 2, 167--181 (1997; Zbl 0884.33011) Full Text: DOI
Lorek, A.; Ruffing, A.; Wess, J. A q-Deformation of the Harmonic Oscillator. arXiv:hep-th/9605161 Preprint, arXiv:hep-th/9605161 [hep-th] (1996). BibTeX Cite \textit{A. Lorek} et al., ``A q-Deformation of the Harmonic Oscillator'', Preprint, arXiv:hep-th/9605161 [hep-th] (1996) Full Text: arXiv
Ruffing, Andreas; Deck, Thomas; Schlichenmaier, Martin String branchings on complex tori and algebraic representations of generalized Krichever-Novikov algebras. (English) Zbl 0774.17027 Lett. Math. Phys. 26, No. 1, 23-32 (1992). MSC: 17B68 14H55 17B81 81R10 81T30 PDFBibTeX XMLCite \textit{A. Ruffing} et al., Lett. Math. Phys. 26, No. 1, 23--32 (1992; Zbl 0774.17027) Full Text: DOI arXiv