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:
“Under that wide hearth
a nest of rattlers,
they’ll knot a hundred together,
had wintered and were coming awake.
The warming rock
flushed them out early.”
—Robert Morgan (b. 1944)