Let . Show that is isomorphic to .
Last edited by Chris L T521; November 21st 2009 at 10:44 PM.
Reason: TeXified question
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Take then let and we have iff and the least such number is (the min. comm. mult.) and it's well known that then since ...
Z12 -> G
defined by n -> (n mod 4, n mod 3 ) is 1:1 and onto.
(a,b) -> 3*a + 4*b mod 12
should also be 1:1 and onto.
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