Talk:Deltaring
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Is every δring a σring? For a counterexample, search sci.math for "deltaring" and "sigmaring" Keith111 03:15, 11 September 2006 (UTC)
"Consider the family of all finite subsets of some infinite set. This is a delta ring, but not a sigma ring." (from "Questions about delta rings") Keith111 06:35, 10 October 2006 (UTC)
"A typical example: the sets in R of finite Lebesgue measure." (from "Questions about delta rings") Keith111 06:57, 10 October 2006 (UTC)
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