From: utzoo!decvax!harpo!floyd!jce Newsgroups: net.math Title: pizza Article-I.D.: floyd.295 Posted: Mon Jun 21 09:47:20 1982 Received: Thu Jun 24 01:41:11 1982 I went to get a pizza the other night, and, since I had six friends over, I asked that he cut it in seven pieces. The pizzaman said he couldn't do it exactly with just straight-edge and compass (it was a greek pizzeria), and I asked him why. He started talking about automorphisms and algebraic fields and other things I don't understand - can anybody explain this in plain english? Is there a general rule?