All Stories

  1. Hodge operators and groups of isometries of diagonalizable symmetric bilinear forms in characteristic two

    Article • Linear Algebra and its Applications, January 2026, Elsevier

    Markus Johannes Stroppel

  2. Split Cayley hexagons via subalgebras of octonion algebras

    Article • Advances in Geometry, July 2025, De Gruyter

    Markus Johannes Stroppel

  3. Subalgebras of octonion algebras

    Article • Journal of Algebra, February 2025, Elsevier

    Markus Johannes Stroppel

  4. An isomorphism between unitals and between related classical groups

    Article • Advances in Geometry, October 2024, De Gruyter

    Markus Johannes Stroppel

  5. Semiaffine stable planes

    Article • Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, November 2023, Springer Science + Business Media

    Markus Johannes Stroppel

  6. Linear spaces embedded into projective spaces via Baer sublines

    Article • Combinatorial Theory, March 2022, California Digital Library (CDL)

    Markus Johannes Stroppel

  7. Unitals with many involutory translations

    Article • Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, March 2022, Springer Science + Business Media

    Markus Johannes Stroppel

  8. Finite subunitals of the Hermitian unitals

    Article • Journal of Geometry, March 2022, Springer Science + Business Media

    Markus Johannes Stroppel

  9. Moufang sets generated by translations in unitals

    Article • Journal of Combinatorial Designs, November 2021, Wiley

    Markus Johannes Stroppel

  10. Embeddings and Ambient Automorphisms of the Pappus Configuration

    Article • Results in Mathematics, November 2019, Springer Science + Business Media

    Markus Johannes Stroppel

  11. Embeddings of hermitian unitals into pappian projective planes

    Article • Aequationes Mathematicae, June 2019, Springer Science + Business Media

    Markus Johannes Stroppel

  12. Generalized quadrangles, Laguerre planes and shift planes of odd order

    Article • Innovations in Incidence Geometry Algebraic Topological and Combinatorial, January 2019, Mathematical Sciences Publishers

    Markus Johannes Stroppel

  13. On elation Laguerre planes with a two-transitive orbit on the set of generators

    Article • Finite Fields and Their Applications, September 2018, Elsevier

    Markus Johannes Stroppel

  14. Transitive groups of similitudes generated by octonions

    Article • Journal of Group Theory, June 2018, De Gruyter

    Markus Johannes Stroppel

  15. Subforms of norm forms of octonion fields

    Article • Archiv der Mathematik, December 2017, Springer Science + Business Media

    Markus Johannes Stroppel

  16. Clifford parallelisms defined by octonions

    Article • Monatshefte für Mathematik, October 2017, Springer Science + Business Media

    Markus Johannes Stroppel

  17. A non-classical unital of order four with many translations

    Article • Discrete Mathematics, December 2016, Elsevier

    Markus Johannes Stroppel

  18. A memorial volume for Günter Pickert

    Article • Journal of Geometry, June 2016, Springer Science + Business Media

    Markus Johannes Stroppel

  19. Desargues configurations: minors and ambient automorphisms

    Article • Journal of Geometry, January 2016, Springer Science + Business Media

    Markus Johannes Stroppel

  20. Heisenberg groups over composition algebras

    Article • Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, December 2015, Springer Science + Business Media

    Markus Johannes Stroppel

  21. Heisenberg groups, semifields, and translation planes

    Article • Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, March 2014, Springer Science + Business Media

    Markus Johannes Stroppel

  22. Unitals over composition algebras

    Article • Forum Mathematicum, January 2014, De Gruyter

    Markus Johannes Stroppel

  23. The Reinhold Baer Colloquium on geometry

    Article • Journal of Geometry, November 2013, Springer Science + Business Media

    Markus Johannes Stroppel

  24. Simple groups acting two-transitively on the set of generators of a finite elation Laguerre plane

    Article • Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, September 2013, Springer Science + Business Media

    Markus Johannes Stroppel

  25. Baer involutions and polarities in Moufang planes of characteristic two

    Article • Advances in Geometry, January 2013, De Gruyter

    Markus Johannes Stroppel

  26. Unitals Admitting All Translations

    Article • Journal of Combinatorial Designs, August 2012, Wiley

    Markus Johannes Stroppel

  27. Stabilizers of subspaces under similitudes of the Klein quadric, and automorphisms of Heisenberg algebras

    Article • Linear Algebra and its Applications, August 2012, Elsevier

    Markus Johannes Stroppel

  28. Polarities and planar collineations of Moufang planes

    Article • Monatshefte für Mathematik, April 2012, Springer Science + Business Media

    Markus Johannes Stroppel

  29. Kernels of linear representations of Lie groups, locally compact groups, and pro-Lie Groups

    Article • Journal of Group Theory, January 2012, De Gruyter

    Markus Johannes Stroppel

  30. Kernels of linear representations of Lie groups, locally compact groups, and pro-Lie Groups

    Article • Journal of Group Theory, December 2011, De Gruyter

    Markus Johannes Stroppel

  31. Early explicit examples of non-desarguesian plane geometries

    Article • Journal of Geometry, December 2011, Springer Science + Business Media

    Markus Johannes Stroppel

  32. Polarities of Schellhammer planes

    Article • Advances in Geometry, January 2011, De Gruyter

    Markus Johannes Stroppel

  33. Orthogonal polar spaces and unitals

    Article • Innovations in Incidence Geometry Algebraic Topological and Combinatorial, January 2011, Mathematical Sciences Publishers

    Markus Johannes Stroppel

  34. Non-Existence of isomorphisms between certain unitals

    Article • Designs Codes and Cryptography, September 2010, Springer Science + Business Media

    Markus Johannes Stroppel

  35. Linearly small elation quadrangles

    Article • Journal of Geometry, November 2009, Springer Science + Business Media

    Markus Johannes Stroppel

  36. Polarities and unitals in the Coulter–Matthews planes

    Article • Designs Codes and Cryptography, September 2009, Springer Science + Business Media

    Markus Johannes Stroppel

  37. Polarities of shift planes

    Article • Advances in Geometry, January 2009, De Gruyter

    Markus Johannes Stroppel

  38. Automorphisms of Hilbert's non-desarguesian affine plane and its projective closure

    Article • Advances in Geometry, January 2007, De Gruyter

    Markus Johannes Stroppel

  39. Locally Compact Groups

    Article • February 2006, European Mathematical Publishing House

    Markus Johannes Stroppel

  40. Automorphisms of Unitals

    Article • Bulletin of the Belgian Mathematical Society - Simon Stevin, January 2006, The Belgian Mathematical Society

    Markus Johannes Stroppel

  41. Affine parts of topological unitals

    Article • Advances in Geometry, January 2005, De Gruyter

    Markus Johannes Stroppel

  42. Polarities of Compact Eight-Dimensional Planes

    Article • Monatshefte für Mathematik, December 2004, Springer Science + Business Media

    Markus Johannes Stroppel

  43. Polar unitals in compact eight-dimensional planes

    Article • Archiv der Mathematik, August 2004, Springer Science + Business Media

    Markus Johannes Stroppel

  44. Independence of axioms for fourgonal families

    Article • Journal of Geometry, December 2001, Springer Science + Business Media

    Markus Johannes Stroppel

  45. Locally compact groups with many automorphisms

    Article • Journal of Group Theory, January 2001, De Gruyter

    Markus Johannes Stroppel

  46. Embedding Actions of Cancellative Directed Semigroups

    Article • Semigroup Forum, January 2001, Springer Science + Business Media

    Markus Johannes Stroppel

  47. The Automorphism Group of a Compact Generalized Polygon has Finite Dimension

    Article • Monatshefte für Mathematik, May 1999, Springer Science + Business Media

    Markus Johannes Stroppel

  48. Homogeneous symplectic maps and almost homogeneous Heisenberg groups

    Article • Forum Mathematicum, January 1999, De Gruyter

    Markus Johannes Stroppel

  49. Finding representatives for the orbits under the automorphism group of a bounded abelian group

    Article • Journal of Algebra, January 1999, Elsevier

    Markus Johannes Stroppel

  50. Bemerkungen zur ersten nicht desarguesschen ebenen Geometrie bei Hilbert

    Article • Journal of Geometry, November 1998, Springer Science + Business Media

    Markus Johannes Stroppel

  51. Homogeneous Locally Compact Groups

    Article • Journal of Algebra, January 1998, Elsevier

    Markus Johannes Stroppel

  52. Actions of almost simple groups on eight-dimensional stable planes

    Article • Mathematische Zeitschrift, September 1997, Springer Science + Business Media

    Markus Johannes Stroppel

  53. The skew-hyperbolic motion group of the quaternion plane

    Article • Monatshefte für Mathematik, September 1997, Springer Science + Business Media

    Markus Johannes Stroppel

  54. Point-regular geometries

    Article • Journal of Geometry, July 1997, Springer Science + Business Media

    Markus Johannes Stroppel

  55. The Semigroup of Continuous Lineations of a Stable Plane

    Article • Semigroup Forum, January 1997, Springer Science + Business Media

    Markus Johannes Stroppel

  56. Pseudo-Homogeneous Coordinates for Hughes Planes

    Article • Canadian Mathematical Bulletin, September 1996, Canadian Mathematical Society

    Markus Johannes Stroppel

  57. Locally compact groups, residual Lie groups, and varieties generated by Lie groups

    Article • Topology and its Applications, June 1996, Elsevier

    Markus Johannes Stroppel, Professor SIDNEY A MORRIS

  58. Connected Orbits in Topological Generalized Quadrangles

    Article • Results in Mathematics, May 1996, Springer Science + Business Media

    Markus Johannes Stroppel

  59. The automorphism group of a compact generalized quadrangle has finite dimension

    Article • Archiv der Mathematik, January 1996, Springer Science + Business Media

    Markus Johannes Stroppel

  60. Varieties of topological groups, Lie groups and SIN-groups

    Article • Colloquium Mathematicum, January 1996, Institute of Mathematics, Polish Academy of Sciences

    Markus Johannes Stroppel

  61. Klingenberg chain spaces

    Article • Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, December 1995, Springer Science + Business Media

    Markus Johannes Stroppel

  62. Actions of almost simple groups on compact eight-dimensional projective planes are classical, almost

    Article • Geometriae Dedicata, November 1995, Springer Science + Business Media

    Markus Johannes Stroppel

  63. Compact Projective Planes

    Article • January 1995, De Gruyter

    Markus Johannes Stroppel

  64. Stable planes

    Article • Discrete Mathematics, May 1994, Elsevier

    Markus Johannes Stroppel

  65. Locally Compact Hughes Planes

    Article • Canadian Mathematical Bulletin, March 1994, Canadian Mathematical Society

    Markus Johannes Stroppel

  66. Slanted symplectic quadrangles

    Article • Geometriae Dedicata, February 1994, Springer Science + Business Media

    Markus Johannes Stroppel

  67. Compact groups of automorphisms of stable planes

    Article • Forum Mathematicum, January 1994, De Gruyter

    Markus Johannes Stroppel

  68. A note on Hilbert and Beltrami systems

    Article • Results in Mathematics, November 1993, Springer Science + Business Media

    Markus Johannes Stroppel

  69. Quaternion Hermitian Planes

    Article • Results in Mathematics, May 1993, Springer Science + Business Media

    Markus Johannes Stroppel

  70. A categorical glimpse at the reconstruction of geometries

    Article • Geometriae Dedicata, April 1993, Springer Science + Business Media

    Markus Johannes Stroppel

  71. Quasi-perspectivities in stable planes

    Article • Monatshefte für Mathematik, March 1993, Springer Science + Business Media

    Markus Johannes Stroppel

  72. Embedding a non-embeddable stable plane

    Article • Geometriae Dedicata, January 1993, Springer Science + Business Media

    Markus Johannes Stroppel

  73. Planar groups of automorphisms of stable planes

    Article • Journal of Geometry, July 1992, Springer Science + Business Media

    Markus Johannes Stroppel

  74. Reconstruction of incidence geometries from groups of automorphisms

    Article • Archiv der Mathematik, June 1992, Springer Science + Business Media

    Markus Johannes Stroppel

  75. On Restrictions of Automorphism Groups of Compact Projective Planes to Subplanes

    Article • Results in Mathematics, May 1992, Springer Science + Business Media

    Markus Johannes Stroppel

  76. A characterization of quaternion planes

    Article • Geometriae Dedicata, January 1990, Springer Science + Business Media

    Markus Johannes Stroppel