Recent content by Polychoron

OK, thanks pals :)

Ya, I thought maybe there is a way to derived it directly from xn-yn...

Nice. I agree that if the identity is right then the inequalities immediately derive from it. But can you prove it? Of course I can see it by open the parenthesis, I simply don't fan of identities that came out of nowhere...

Guess what? I just got my new calculus book last week! ^^ The book opens with the definition of the real numbers by Dedekind and goes to prove properties of this numbering system such as The supremum axiom and others. At the end of the chapter are about 30 exercises without their solutions...