Trigger warnings for this post:
- Suffering and pain.
- Cessation of life.
- Mathematics.
After the post of December 9, for some reason I wanted to record here a surgical operation in 2019. Then I became preoccupied with mathematics.

Hera Büyüktaşcıyan, “Dendrologia,” 2023; part of an exhibit called Phantom Quartet at Arter Istanbul, visited Wednesday, February 4, 2026. The bark of the masks is said to be taken from dead trees on the Isle of Vassivière in the artificial Lac de Vassivière, Limousin, France
On the subject of mathematics, let me take the opportunity to recommend “The Tool/Weapon Duality of Mathematics,” by Alexandre Borovik, recently published in the Journal of Humanistic Mathematics (volume 16, number 1, January 2026; pages 365–392). Continue reading








