pseudointersection

English

Etymology

pseudo- +‎ intersection

Noun

pseudointersection (plural pseudointersections)

1. (mathematics) A set for which the number of elements that are not in the intersection (of two infinite sets) is finite.
   • 2016, Jörg Brendle, Barnabás Farkas, Jonathan Verner, “Towers in filters, cardinal invariants, and Luzin type families”, in arXiv‎^[1]:

     We investigate which filters on $\omega$ can contain towers, that is, a modulo finite descending sequence without any pseudointersection (in $[\omega ]^{\omega }$).