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Of Theory
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Set Theory: Laws and Proofs
courses.physics.illinois.eduIan Ludden Set Theory: Laws and Proofs4/7. Proving Set Inclusion A B !8a 2A, a 2B Let a 2A be arbitrary. [Details] So a 2B. Since a was arbitrarily chosen, we conclude A B. Example De ne A = a 2Z : a2 9 is odd and jaj< 25 and B = fb 2Z : b is eveng. Prove A B.