## Question

###### Exercise 1. Consider the binary relation on N X N (which is a subset of (N x N) x (N x N)) defined by (a,6) (c,d) if and only if a+d = c+b. Prove that this is an equivalence relation. You may only use properties of N, not Z_

Exercise 1. Consider the binary relation on N X N (which is a subset of (N x N) x (N x N)) defined by (a,6) (c,d) if and only if a+d = c+b. Prove that this is an equivalence relation. You may only use properties of N, not Z_

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