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Abstract Algebra I Corollary 1.26- Two equivalence classes of an equivalence relation are either disjoint or...

Abstract Algebra I

Corollary 1.26- Two equivalence classes of an equivalence relation are either disjoint or equal.

Corollary 2.11- Let a and b be two integers that are relatively prime. Then there exist integers r and s such that ar+bs=1.

PLEASE ANSWER THE FOLLOWING:

1) Why is Corollary 1.26 true?

2) Why is Corollary 2.11 true?

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