When I studied geometry in prep school back in the early 1960's the teacher showed us a proof of the Pythagorean theorem that had been divised by James A. Garfield, later President of the United States, as a young man. It was a particularly elegant proof--far more elegant than Pythagoras's own.
Naturally, I can't remember it and have been unable to find it. Would anyone know of this proof and when and where Garfield devised it?
I'm a historian, not a mathematician, but I need this for a piece I'm writing.