Question: Let (A, R1), (B, R2) be two posets. On A B, define relation R by (a, b) R (x, y) if a R1 x

Let (A, R1), (B, R2) be two posets. On A × B, define relation R by (a, b) R (x, y) if a R1 x and b R2 y. Prove that R is a partial order.

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