"I have discovered a truly marvelous demonstration of this proposition that this margin is too narrow to contain." https://www.joh.cam.ac.uk/library/special_collections/early_books/fermat.htm#:%7E:text=When%20reviewing%20his%20copy%20of,to%20fit%20in%20the%20margin
Even worse is they reply to themselves
figured it outand say nothing else."I have discovered a truly marvelous demonstration of this proposition that this margin is too narrow to contain." https://www.joh.cam.ac.uk/library/special_collections/early_books/fermat.htm#:%7E:text=When%20reviewing%20his%20copy%20of,to%20fit%20in%20the%20margin