Question: For a set A, let R1 and R2 be symmetric relations on A. If R1 o R2 R2 o R1, prove that R1 o

For a set A, let R1 and R2 be symmetric relations on A. If R1 o R2 ⊆ R2 o R1, prove that R1 o R2 = R2 o R1.

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