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 Definition The size, i.e., the number of elements, of a (possibly infinite) set. [d] [e]
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== "Cardinality" moved ""

I moved the former "Cardinality" to cardinal number where the formal theory and cardinal number arithmetic belongs. "Cardinality" is best used for informally explaining the concept. Peter Schmitt 23:24, 26 June 2009 (UTC)