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Professor Krishan L. Duggal: A Biographical Note

Year 2023, , 1 - 3, 30.04.2023
https://doi.org/10.36890/iejg.1253398

Abstract

In this note, we present a biographical sketch of the life and academic contributions of late Professor Krishan L. Duggal. His contributions span from Riemannian and Lorentzian geometries of manifolds with various structural groups of the tangent bundle, Lightlike curves and submanifolds, Cauchy-Riemann geometry, Symmetries of semi-Riemannian manifolds, to Killing horizons. In particular, his approach to the study of lightlike submanifolds is remarkable and drawn considerable interest of many geometers.

Supporting Institution

University Of New Haven

References

  • [1] Barletta, E., Dragomir, S. and Duggal, K.L.: Foliations in Cauchy-Riemann Geometry, Mathematical Surveys and Monographs, American Mathematical Society, 2007.
  • [2] Beem, J.K. and Duggal, K.L.: Differential geometry and Mathematical Physics, Contemporary Mathematics, Volume 170, American Mathematical Society, 1994.
  • [3] Bejancu, A.: Lightlike curves in Lorentzian manifolds, Publicationes Math. Debrecen 44 (1994), 145-155.
  • [4] Bejancu, A. and Duggal, K.L.: Degenerate hypersurfaces of semi-Riemannian manifolds, Buletinul Institului Politehnic, Iasi 37 (1991),3-22.
  • [5] Duggal, K.L.: Almost Ricci solitons and physical applications, Internat. Electron. J. Geom. 10 (2017), 1-10.
  • [6] Duggal, K.L.: A new class of contact pseudo Framed manifolds with applications, Internat. J. Math. Math. Sci. (2021), 1-9, doi:10.1155/2021/6141587.
  • [7] Duggal, K.L. and Bejancu, A.: Lightlike submanifolds of Semi-Riemannian Manifolds and Applications, Mathematics and Its Applications, Volume 364, Springer, 2010.
  • [8] Duggal, K.L. and Jin, D.H.: Null curves and hypersurfaces of Semi-Riemannian Manifolds, World Scientific, 2007.
  • [9] Duggal, K. L. and Şahin, B. Screen conformal half-lightlike submanifolds. Int. J. Math. Math. Sci. 65-68, (2004), 3737–3753.
  • [10] Duggal, K. L. and Şahin, B. Screen Cauchy Riemann lightlike submanifolds. Acta Math. Hungar. 106 (1-2), (2005), 137–165.
  • [11] Duggal, K. L. and Şahin, B. Generalized Cauchy-Riemann lightlike submanifolds of Kaehler manifolds. Acta Math. Hungar. 112(1-2),(2006), 107–130.
  • [12] Duggal, K. L. and Şahin, B. Lightlike submanifolds of indefinite Sasakian manifolds. Int. J. Math. Math. Sci. 2007, Art. ID 57585, 21 pp.
  • [13] Duggal, K. L. and Şahin, B. Generalized Cauchy-Riemann lightlike submanifolds of indefinite Sasakian manifolds. Acta Math. Hungar. 122(1-2), (2009), 45–58.
  • [14] Duggal, K.L. and Şahin, B.: Differential geometry of Lightlike Submanifolds, Frontiers in Mathematics, Springer, 2010.
  • [15] Duggal, K.L. and Sharma, R.: Lorentzian framed structures in general relativity, General Relativity and Gravitation 19 (1986), 71-77.
  • [16] Duggal, K.L. and Sharma, R.: Conformal collineations and anisotropic fluids in general relativity, Journal of Mathematical Physics 27(1986), 2511-2513.
  • [17] Duggal, K.L. and Sharma, R.: Mixed foliate CR-submanifolds of indefinite complex space-forms, Annali di Matematica Pura ed Applicata 149 (1987), 103-111.
  • [18] Duggal, K.L. and Sharma, R.: Ricci curvature inheriting symmetries of semi-Riemannian manifolds, Contemporary Mathematics (American Mathematical Society) 170 (1994), 215-224.
  • [19] Duggal, K.L. and Sharma, R. : Symmetries of Spacetimes and Riemannian Manifolds, Mathematics and its Applications, Vol. 487, Kluwer Academic Press,1999 (Taken over by Springer-Science).
  • [20] Duggal, K.L. and Sharma, R. : Recent Advances in Riemannian and Lorentzian Geometries, Contemporary Mathematics, Volume 337, American Mathematical Society.
  • [21] Kupeli, D.N.: Singular Semi-Riemannian Geometry, Vol. 366, Kluwer Academic Press, 1996.
  • [22] Sharma, R.: Cauchy-Riemann Submanifolds of Semi-Riemannian Manifolds with Application to Relativity and Hydrodynamics, Ph.D. dissertation, University of Windsor, Ontario, Canada, 1986.
  • [23] Sharma, R. and Duggal, K.L.: Solutions of Einstein’s equations with conformal symmetries and a contact slice, Nonlinear Analysis, Theory, Methods and Applns. 71 (2009), e701-705.
Year 2023, , 1 - 3, 30.04.2023
https://doi.org/10.36890/iejg.1253398

Abstract

References

  • [1] Barletta, E., Dragomir, S. and Duggal, K.L.: Foliations in Cauchy-Riemann Geometry, Mathematical Surveys and Monographs, American Mathematical Society, 2007.
  • [2] Beem, J.K. and Duggal, K.L.: Differential geometry and Mathematical Physics, Contemporary Mathematics, Volume 170, American Mathematical Society, 1994.
  • [3] Bejancu, A.: Lightlike curves in Lorentzian manifolds, Publicationes Math. Debrecen 44 (1994), 145-155.
  • [4] Bejancu, A. and Duggal, K.L.: Degenerate hypersurfaces of semi-Riemannian manifolds, Buletinul Institului Politehnic, Iasi 37 (1991),3-22.
  • [5] Duggal, K.L.: Almost Ricci solitons and physical applications, Internat. Electron. J. Geom. 10 (2017), 1-10.
  • [6] Duggal, K.L.: A new class of contact pseudo Framed manifolds with applications, Internat. J. Math. Math. Sci. (2021), 1-9, doi:10.1155/2021/6141587.
  • [7] Duggal, K.L. and Bejancu, A.: Lightlike submanifolds of Semi-Riemannian Manifolds and Applications, Mathematics and Its Applications, Volume 364, Springer, 2010.
  • [8] Duggal, K.L. and Jin, D.H.: Null curves and hypersurfaces of Semi-Riemannian Manifolds, World Scientific, 2007.
  • [9] Duggal, K. L. and Şahin, B. Screen conformal half-lightlike submanifolds. Int. J. Math. Math. Sci. 65-68, (2004), 3737–3753.
  • [10] Duggal, K. L. and Şahin, B. Screen Cauchy Riemann lightlike submanifolds. Acta Math. Hungar. 106 (1-2), (2005), 137–165.
  • [11] Duggal, K. L. and Şahin, B. Generalized Cauchy-Riemann lightlike submanifolds of Kaehler manifolds. Acta Math. Hungar. 112(1-2),(2006), 107–130.
  • [12] Duggal, K. L. and Şahin, B. Lightlike submanifolds of indefinite Sasakian manifolds. Int. J. Math. Math. Sci. 2007, Art. ID 57585, 21 pp.
  • [13] Duggal, K. L. and Şahin, B. Generalized Cauchy-Riemann lightlike submanifolds of indefinite Sasakian manifolds. Acta Math. Hungar. 122(1-2), (2009), 45–58.
  • [14] Duggal, K.L. and Şahin, B.: Differential geometry of Lightlike Submanifolds, Frontiers in Mathematics, Springer, 2010.
  • [15] Duggal, K.L. and Sharma, R.: Lorentzian framed structures in general relativity, General Relativity and Gravitation 19 (1986), 71-77.
  • [16] Duggal, K.L. and Sharma, R.: Conformal collineations and anisotropic fluids in general relativity, Journal of Mathematical Physics 27(1986), 2511-2513.
  • [17] Duggal, K.L. and Sharma, R.: Mixed foliate CR-submanifolds of indefinite complex space-forms, Annali di Matematica Pura ed Applicata 149 (1987), 103-111.
  • [18] Duggal, K.L. and Sharma, R.: Ricci curvature inheriting symmetries of semi-Riemannian manifolds, Contemporary Mathematics (American Mathematical Society) 170 (1994), 215-224.
  • [19] Duggal, K.L. and Sharma, R. : Symmetries of Spacetimes and Riemannian Manifolds, Mathematics and its Applications, Vol. 487, Kluwer Academic Press,1999 (Taken over by Springer-Science).
  • [20] Duggal, K.L. and Sharma, R. : Recent Advances in Riemannian and Lorentzian Geometries, Contemporary Mathematics, Volume 337, American Mathematical Society.
  • [21] Kupeli, D.N.: Singular Semi-Riemannian Geometry, Vol. 366, Kluwer Academic Press, 1996.
  • [22] Sharma, R.: Cauchy-Riemann Submanifolds of Semi-Riemannian Manifolds with Application to Relativity and Hydrodynamics, Ph.D. dissertation, University of Windsor, Ontario, Canada, 1986.
  • [23] Sharma, R. and Duggal, K.L.: Solutions of Einstein’s equations with conformal symmetries and a contact slice, Nonlinear Analysis, Theory, Methods and Applns. 71 (2009), e701-705.
There are 23 citations in total.

Details

Primary Language English
Subjects Mathematical Sciences
Journal Section Research Article
Authors

R. Sharma 0000-0001-5026-8564

Bayram Şahin 0000-0002-9372-1151

Publication Date April 30, 2023
Acceptance Date March 1, 2023
Published in Issue Year 2023

Cite

APA Sharma, R., & Şahin, B. (2023). Professor Krishan L. Duggal: A Biographical Note. International Electronic Journal of Geometry, 16(1), 1-3. https://doi.org/10.36890/iejg.1253398
AMA Sharma R, Şahin B. Professor Krishan L. Duggal: A Biographical Note. Int. Electron. J. Geom. April 2023;16(1):1-3. doi:10.36890/iejg.1253398
Chicago Sharma, R., and Bayram Şahin. “Professor Krishan L. Duggal: A Biographical Note”. International Electronic Journal of Geometry 16, no. 1 (April 2023): 1-3. https://doi.org/10.36890/iejg.1253398.
EndNote Sharma R, Şahin B (April 1, 2023) Professor Krishan L. Duggal: A Biographical Note. International Electronic Journal of Geometry 16 1 1–3.
IEEE R. Sharma and B. Şahin, “Professor Krishan L. Duggal: A Biographical Note”, Int. Electron. J. Geom., vol. 16, no. 1, pp. 1–3, 2023, doi: 10.36890/iejg.1253398.
ISNAD Sharma, R. - Şahin, Bayram. “Professor Krishan L. Duggal: A Biographical Note”. International Electronic Journal of Geometry 16/1 (April 2023), 1-3. https://doi.org/10.36890/iejg.1253398.
JAMA Sharma R, Şahin B. Professor Krishan L. Duggal: A Biographical Note. Int. Electron. J. Geom. 2023;16:1–3.
MLA Sharma, R. and Bayram Şahin. “Professor Krishan L. Duggal: A Biographical Note”. International Electronic Journal of Geometry, vol. 16, no. 1, 2023, pp. 1-3, doi:10.36890/iejg.1253398.
Vancouver Sharma R, Şahin B. Professor Krishan L. Duggal: A Biographical Note. Int. Electron. J. Geom. 2023;16(1):1-3.