Suppose that G1,G2⋯ are
cellular upper semicontinuous decompositions of an n-manifold with boundary
M(n≠4) such that for i = 1,2,⋯,M∕Gi is homeomorphic to M. Let G be the
decomposition of M obtained from the decomposition of Gi in the following
manner. A set g belongs to G if and only if g is a nondegenerate element of
some Gi or g is a point in M − (∪i=1∞HGi∗). It will be shown that if the
various decompositions fit together in a “continuous” manner and if G is an
upper semicontinuous decomposition of M, then M∕G is homeomorphic to
M.