In an infinite-dimensional space V, as used in functional analysis, the flag idea generalises to a subspace nest, namely a collection of subspaces of V that is a total order for inclusion and which further is closed under arbitrary intersections and closed linear spans. See nest algebra.
Read more about this topic: Flag (linear Algebra)
Famous quotes containing the word nest:
“Now’s the time for mirth and play,
Saturday’s an holiday;
Praise to heaven unceasing yield,
I’ve found a lark’s nest in the field.”
—Christopher Smart (1722–1771)