### Some articles on *cardinal invariants, cardinal invariant, cardinal, invariant, invariants*:

Axioms Of Set Theory - Areas of Study -

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**Cardinal Invariants**... A

**cardinal invariant**is a property of the real line measured by a**cardinal**number ... For example, a well-studied**invariant**is the smallest cardinality of a collection of meagre sets of reals whose union is the entire real line ... These are**invariants**in the sense that any two isomorphic models of set theory must give the same**cardinal**for each**invariant**...### Famous quotes containing the word cardinal:

“What people don’t realize is that intimacy has its conventions as well as ordinary social intercourse. There are three *cardinal* rules—don’t take somebody else’s boyfriend unless you’ve been specifically invited to do so, don’t take a drink without being asked, and keep a scrupulous accounting in financial matters.”

—W.H. (Wystan Hugh)

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