Chapter 7 Cardinality of sets - Web hosting

4 CHAPTER 7. CARDINALITY OF SETS Corollary 7.2.1 suggests a way that we can start to measure the \size" of in nite sets. We will say that any sets A and B have the same cardinality, and write jAj= jBj, if A and B can be put into 1-1 correspondence. If A can be put into 1-1 correspondence with a subset of B (that is, there is a 1-1 ................
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