For any sets A, B and C, let R 1 be a relation from A to B
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For any sets A, B and C, let R 1 be a relation from A to B and R 2 be a relation from B to C, Define the composition of R 1 and R 2 to be the relation from A to C given by
(b) Prove that for any sets A, B, C, D and for any relations R 1 from A to B, R 2 from B to C and R 3 from C to D, we have
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