Birthday

Happy birthday (possibly belatedly), thebluerose!

E/NE 3: They're All Right

The proof of Saccheri-Legendre that I gave last time is, as I said, pretty involved. I need that theorem, though, for what comes next; if you're willing to accept it as true, most of what's left will be quite a bit easier. Give it a try, OK?

( Rectangles )