Diagonal intersection
From Wikipedia, the free encyclopedia
In mathematics, particularly in set theory, if
is a sequence then the diagonal intersection,
- Δi < αSi
is defined to be
- .
That is, β is in Δi < αSi if it is contained in the first β members of the sequence.
See also: Fodor's lemma, club set, club filter
This article incorporates material from diagonal intersection on PlanetMath, which is licensed under the GFDL.