1. How to notate a crossing of strings? On Modesto Dedò’s notation of braids

   • Michael Friedman

   OriginalPaper 10 October 2019 Pages: 281 - 312

   

2. Cracking bones and numbers: solving the enigma of numerical sequences on ancient Chinese artifacts

   • Andrea Bréard
   • Constance A. Cook

   OriginalPaper 10 December 2019 Pages: 313 - 343

   

3. On Qin Jiushao’s writing system

   • Zhu Yiwen

   OriginalPaper 04 January 2020 Pages: 345 - 379

   

4. Poincaré’s stated motivations for topology

   • Lizhen Ji
   • Chang Wang

   OriginalPaper 04 March 2020 Pages: 381 - 400