If A A', B B' and : A B is injective, then there is an
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If A ∼ A', B ∼ B' and ∫: A →B is injective, then there is an injective map A' → B'. Therefore the relation ≤ on cardinal numbers is well defined.
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Related Book For
Algebra Graduate Texts In Mathematics 73
ISBN: 9780387905181
8th Edition
Authors: Thomas W. Hungerford
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