From: utzoo!decvax!yale-com!leichter Newsgroups: net.math Title: Re: The Funny Nature of Infinity Article-I.D.: yale-com.733 Posted: Wed Jan 26 21:26:05 1983 Received: Sun Jan 30 09:13:32 1983 References: ihuxe.193 In fact: Def: A is INFINITE if and only if there is a proper subset B of A such that A and B can be put in one-to-one correspondence. (If you are used to some other definition of "infinite" you may find it en- lightening to prove the two definitios equivalent.) -- Jerry decvax!yale-comix!leichter