Inmathematics, a subbundle of a vector bundle
on a topological space
is a collection of linear subspaces
of the fibers
of
at
in
that make up a vector bundle in their own right.
In connection with foliation theory, a subbundle of the tangent bundle of a smooth manifold may be called a distribution (oftangent vectors).
If a set of vector fields span the vector space
and all Lie commutators
are linear combinations of the
then one says that
is an involutive distribution.