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:
“This face is a dog’s snout sniffing for garbage,
Snakes nest in that mouth, I hear the sibilant threat.”
—Walt Whitman (1819–1892)