My Math Forum Isomorphism

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 February 12th, 2012, 03:50 PM #1 Member   Joined: Oct 2011 Posts: 35 Thanks: 0 Isomorphism I need to determine if the given map ? is an isomorphism of the first binary structure with the second, and if it is not an isomorphism, why not? I have, ?Q , . ? with ?Q , . ? where ?(x) = x^2 for x ? Q (the dot in the brackets is my atempt to to represent multiplication) Smart people.. please help!!
 February 14th, 2012, 10:27 AM #2 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Re: Isomorphism ?(1) = ?(-1), so it's not even injective.
 February 14th, 2012, 04:12 PM #3 Member   Joined: Oct 2011 Posts: 35 Thanks: 0 Re: Isomorphism It was easier than I thought..

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