Proof that If A,A',B,B' are sets such that lAl = IA'I and lBl = IB'I, then IA
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Proof that If A,A',B,B' are sets such that lAl = IA'I and lBl = IB'I, then IA X Bl = IA' X B'I. u in addition A ∩ B = Ø = A' ∩ B', then IA ∪ Bl = IA' ∪ B'I- Therefore multiplication and addition of cardinals is well defined.
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Algebra Graduate Texts In Mathematics 73
ISBN: 9780387905181
8th Edition
Authors: Thomas W. Hungerford
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