'Jon Perry hasn't shown us much of his proof, but a hint he dropped prompts me to make a guess of what he's thinking. I conjecture that Jon has developed some kind of description, signature, or characterization of 3-manifolds, and can prove that simply-connectedness imposes a constraint that only one such signature meets. If this is the approach, the place to look for a flaw is the necessary lemma that two manifolds with the same signature are homeomorphic.' This is close. I have developed a schema for characterizing ANY x-manifold, and in my scheme simply connected spaces fall into exactly one category, and hence are equivalent. As the maths is new, I haven't yet explored all the necessary bits that form a full proof, but I don't see this as being as hard as the original conjecture seems. I would spill the beans, but with $1million up for grabs, my sense of need for privacy is still winning. Jon Perry perry@globalnet.co.uk http://www.users.globalnet.co.uk/~perry/maths/ http://www.users.globalnet.co.uk/~perry/DIVMenu/ BrainBench MVP for HTML and JavaScript http://www.brainbench.com