Abstract

In this paper, we consider certain cardinals in ZF #set theory without AC, the Axiom of Choice#. In ZFC #set theory with AC#, given any cardinals C and D; either C # D or D # C: However, in ZF this is no longer so. For a given in#nite set A consider seq 1 1 #A#, the set of all sequences of A without repetition. We compare seq 1 1 #A# , the cardinality of this set, to P#A# , the cardinality of the power set of A. What is provable about these two cardinals in ZF? The main result of this...

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