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- From: horn@schaefer.math.wisc.edu (Jeffrey Horn)
- Newsgroups: sci.math
- Subject: Cardinality of sigma-rings
- Message-ID: <1992Jul21.175055.13821@schaefer.math.wisc.edu>
- Date: 21 Jul 92 17:50:55 GMT
- Organization: Univ. of Wisconsin Dept. of Mathematics
- Lines: 2
-
- Is there a way to prove that no sigma ring can have the cardinality of the
- natural numbers without referring to the Hausdorf maximality theorem?
-