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May 27th, 2008, 05:35 AM  #1 
Newbie Joined: Mar 2008 Posts: 11 Thanks: 0  Cardinality Proof Question, Please help.
Hello, Can someone do this question please ? I can't do it. Prove that if A ≤ B and B ≤ C then A ≤ C Note: A ≤ B means "there exist an injection from set A into set B" and so on for the rest. I would really appreciate it if someone can help me because I find this very hard. 
May 27th, 2008, 06:05 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: Cardinality Proof Question, Please help. Quote:
 

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