June 12th, 2010, 11:08 PM  #1 
Member Joined: Feb 2009 Posts: 76 Thanks: 0  Equivalence relations
I honestly don't understand what my prof is trying to ask me. He writes his own problems and I can barely read his handwriting. "let (a,b) is equivalent to (c,d) if ad = bc. (we write this as (a,b) ~ (c,d) Show that ~ is an equivalent relation. " I know that an equivalence relation is a reflexive (a,a) E R , symmetric (a,b) E R then (b,a) E R and transitive (a,b) E R and (b, c) E R then (a,c) E R. But I don't know where to begin 
June 13th, 2010, 12:10 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: Equivalence relations Quote:
 

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