2 papers
math.GR2025
On the complexity of the word problem of the R. Thompson group V
J. C. Birget
We analyze the proof by Lehnert and Schweitzer that the word problem of the Thompson group V is co-context-free, and we show that this word problem is the complement of the cyclic…
math.HO2024
Remembering Mark Sapir
Jean-Camille Birget, Gili Golan, Alexander Olshanskii +1
This memorial article for Mark Sapir provides a brief overview of his life and career. Among his many contributions we highlight two of his most celebrated achievements: his ground…