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Advanced MathQ&A Librarynotes Let A and B be sets. If there exists an injection f: of A is less cardinality aof B, written A ĥ B. If there exists á surjectionf:A→B, the cardinality of A is greater than or equal to the writfen A →Bithe cardinality than or equal to the cardină lity of B, al Prove that if A ĥ B, then B2 A. b) Prove that if A Ś B and Aà B, then AnB.Start your trial now! First week only $4.99!*arrow_forward*

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