Sur une erreur dans les EGA
arXiv:1610.05096
Abstract
A mistake is pointed out in EGA I, Elements of algebraic geometry, concerning corollary (2.4.4) which is not correct. Quite likely, the hitch has already been noticed, and reported, but we know not who, nor where. New research is recommended to find out if the error has spread or not, in the book and, further, in the literature.
The 3 page note is written in French with a detailed summary in English