1. Beiträge zur Algebra und Geometrie: half a century

   • Horst Martini

   Editorial 13 March 2021 Pages: 1 - 4

2. Correction to: Beiträge zur Algebra und Geometrie: half a century

   • Horst Martini

   Correction 19 April 2021 Pages: 5 - 5

3. Around Efimov’s differential test for homeomorphism

   • Victor Alexandrov

   Original Paper 20 November 2020 Pages: 7 - 20

4. A new algorithm to classify chiral polytopes with a given automorphism group

   • Francis Buekenhout
   • Dimitri Leemans
   • Philippe Tranchida

   Original Paper 16 February 2021 Pages: 21 - 36

   

5. Characterising Clifford parallelisms among Clifford-like parallelisms

   • Hans Havlicek
   • Stefano Pasotti
   • Silvia Pianta

   Original Paper Open access 27 June 2020 Pages: 37 - 54

   

6. Vertex-facet assignments for polytopes

   • Thomas Jahn
   • Martin Winter

   Original Paper Open access 05 June 2020 Pages: 55 - 63

   

7. Forbidden patterns in tropical plane curves

   • Michael Joswig
   • Ayush Kumar Tewari

   Original Paper Open access 19 August 2020 Pages: 65 - 81

   

8. Smallest polyhedral tilings of 3-tori by parallelohedra

   • Ulrich Brehm
   • Wolfgang Kühnel

   Original Paper 15 September 2020 Pages: 83 - 100

   

9. Identifying a polytope by its fibre polytopes

   • Peter McMullen

   Original Paper Open access 11 September 2020 Pages: 101 - 108

10. Axiom systems implying infinity in the foundations of geometry

    • Victor Pambuccian
    • Rolf Struve

    Original Paper 06 October 2020 Pages: 109 - 120

    

11. The complete characterization of tangram pentagons

    • Sarah Sophie Pohl
    • Christian Richter

    Original Paper Open access 14 September 2020 Pages: 121 - 135

    

12. Algebraic aspects of hypergeometric differential equations

    • Thomas Reichelt
    • Mathias Schulze
    • Uli Walther

    Original Paper Open access 02 February 2021 Pages: 137 - 203

    

13. On M-predecomposable sets

    • Valeriu Soltan

    Original Paper 06 July 2020 Pages: 205 - 218

14. Triangles of nearly equal area

    • Konrad J. Swanepoel

    Original Paper Open access 04 March 2021 Pages: 219 - 227

    

15. The \({\mathcal {S}}\)-cone and a primal-dual view on second-order representability

    • Helen Naumann
    • Thorsten Theobald

    Original Paper Open access 08 July 2020 Pages: 229 - 249

    

16. Lagrangian submanifolds in complex space forms satisfying equality in the optimal inequality involving \(\delta (2,\ldots ,2)\)

    • Bang-Yen Chen
    • Luc Vrancken
    • Xianfeng Wang

    Original Paper 17 November 2020 Pages: 251 - 264

17. Packings, sausages and catastrophes

    • Martin Henk
    • Jörg M. Wills

    Original Paper Open access 30 May 2020 Pages: 265 - 280

    

18. Covering a convex body vs. covering the set of its extreme points

    • Senlin Wu
    • Baofang Fan
    • Chan He

    Original Paper 13 July 2020 Pages: 281 - 290