mes timbres poste personnalisés (TPP) - my personalized postage stamps

2010	2017	2019 Je pense, donc je suis. - I think, therefore I am.
échiquier et son inverse - chess and its inverse	So little time, so much to do!	the golden ratio
le monde des polyèdres - the polyhedra world 2021
two nets for one tetrahedron one net for two deltahedra
	polyèdres duals - dual polyhedra le cube et l'octaèdre régulier sont aussi duals the cube and the regular octahedron are also dual le tétraèdre est auto-dual - the tetrahedron is self-dual
2021
cordonnier, pas plus haut que la sandale (Apelle) shoemaker, no higher than the sandal (ultracrépidarianisme - ultracrepidarianism)	"Game of Life" - Game over, John. Thanks for playing! I would really like to know, before I die, why the monster group exists.	Sometimes you have to complicate a problem to simplify its solution.
quelques fondamentaux de géométrie plane - some fundamentals of plane geometry 2022
	cueille le jour présent sans te soucier du lendemain seize the present day without worrying about tomorrow
2023
Greek mathematician, astronomer and philosopher, and beautiful! She was assassinated in 415 for having transmitted to her students a certain idea of ​​freedom and knowledge. Daughter of Lord Byron, mathematician and pioneer of computer coding. ADA is a computer language created in 1980 for the United States Department of Defense, and an AI-based chatbot.

timbres d'Océanie surchargés "Victoire" à vendre - French Oceania stamps overprinted "Victory" for sale