1. On Translations of Hilbert’s Grundlagen

   • Albert C. Lewis

   Letter to the Editors 26 October 2021 Pages: 1 - 1

2. A Direct Proof of the Steiner–Lehmus Theorem

   • Victor Pambuccian

   Letter to the Editors 15 October 2021 Pages: 2 - 2

3. Is There a Direct Geometric Proof of the Steiner–Lehmus Theorem?

   • O. A. S. Karamzadeh

   Letter to the Editors 22 November 2021 Pages: 3 - 4

4. “Not Just an Idle Game”:

   • Ronald Brown

   Article Open access 05 September 2021 Pages: 5 - 15

   

5. Self-Crossing Geodesics

   • Anton Petrunin

   Mathematical Gems and Curiosities 28 October 2021 Pages: 16 - 18

   

6. Lessons from the German Tank Problem

   • George Clark
   • Alex Gonye
   • Steven J. Miller

   Article 06 August 2021 Pages: 19 - 28

   

7. All Tied Up

   • Colin Adams

   Mathematically Bent 15 March 2021 Pages: 29 - 31

8. Proof without Words: Inequality for the Sum of the Diagonals

   • Nenad Stojanović

   Note 01 June 2021 Pages: 32 - 32

   

9. A History of Mathematics in South Africa: Modern Milestones

   • Tomoko L. Kitagawa
   • Eder Kikianty

   Mathematical Communities 26 October 2021 Pages: 33 - 47

   

10. A Replication Crisis in Mathematics?

    • Anthony Bordg

    Viewpoint Open access 05 March 2021 Pages: 48 - 52

11. Sandstone Geometry on the Colorado Plateau

    • Stan Wagon
    • H. Allen Curran

    Mathematical Tourist 13 October 2021 Pages: 53 - 59

    

12. Proof Without Words: Sums of Powers of Eight

    • Rajib Mukherjee

    Note 25 June 2021 Pages: 60 - 61

    

13. On Mathematical Towers of Babel and “Translation” as an Epistemic Category

    • Michael Friedman

    Years Ago Open access 30 March 2020 Pages: 62 - 73

    

14. Final Integer

    • Thomas Reed Willemain

    Poem or Fiction 07 July 2021 Pages: 74 - 75

15. Changing the Rules: The Legacy of Robert Abbott

    • Jim Henle

    For Our Mathematical Pleasure 30 August 2021 Pages: 76 - 81

    

16. The Secret Formula by Fabio Toscano

    • Andrew J. Simoson

    OriginalPaper 19 April 2021 Pages: 83 - 84

17. The Great Rift: Literacy, Numeracy, and the Religion–Science Divide by Michael E. Hobart

    • Sam Williams

    Book Review 16 April 2021 Pages: 85 - 88

18. What’s Next? The Mathematical Legacy of William P. Thurston Edited by Dylan Thurston

    • Athanase Papadopoulos

    Book Review 16 June 2021 Pages: 89 - 93

    

19. Biographie. Felix Hausdorff, Gesammelte Werke. Band IB. by Egbert Brieskorn and Walter Purkert

    • Gert Schubring

    Book Review Open access 21 June 2021 Pages: 94 - 98

20. The Tenth Muse by Catherine Chung

    • Mary Gray

    Book Review 17 June 2021 Pages: 99 - 100

21. Mathematics in Nature

    • Robin Wilson

    Stamp Corner 26 February 2021 Pages: 102 - 102