November 5th, 2008, 07:26 AM  #1 
Newbie Joined: Nov 2008 Posts: 2 Thanks: 0  urgent help
need some help with this question Let (a,b)=1 and ab=c^2. Show that a and b are perfect squares. Thank you 
November 5th, 2008, 12:32 PM  #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: urgent help
Write a and b in the form x^2 * y with (x, y) = 1. The result follows pretty quickly.

November 5th, 2008, 11:51 PM  #3 
Newbie Joined: Nov 2008 Posts: 2 Thanks: 0  Re: urgent help
How can I write them in this form? Using prime factorization? Thx


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