In Result 4.21, it was proved for sets A and B that A B = A if and only if B A. Provide
Chapter 4, Problem 4.41(choose chapter or problem)
In Result 4.21, it was proved for sets A and B that A B = A if and only if B A. Provide another proofof this result by giving a direct proof of the implication If A B = A, then B A and a proof bycontrapositive of its converse.
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