Posted by **Martin** on Friday, November 18, 2011 at 1:13pm.

Suppose R is the relation on N where aRb means that a ends in the same digit in which b ends. Determine whether R is an equivalence relation on N. And,

Suppose that R and S are equivalence relations on a set A. Prove that the R ¿ S is also an equivalence relation on A.

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