A small cover is a smooth closed manifold [M.sup.n] which admits a locally standard [Z.sup.n.sub.2]-action whose orbit space is a simple convex polytope
It is based on the premise that the composite limit state will form a convex polytope
. It comprises two general steps.
A convex polytope
satisfying these properties is called a Delzant polytope.
Consider a dimension n convex polytope
[DELTA] [subset] [([R.sup.n]).sup.*].
A DOP is a convex polytope
containing the object, constructed by taking a number k of appropriately oriented planes at infinity and bringing it closer to the object until they collide.
Any A(p(k)) and C(p(k)) belong to a convex polytope
[OMEGA] defined by
Note that any convex polytope
can be written in the form [[PI].sub.X](u) for suitable X and u.
The convexity theorem of Atiyah  and Guillemin-Sternberg  implies that [mu](M) is a convex polytope
 shows that every arrangement of spheres (and hence every central arrangemen of hyperplanes) is combinatorially equivalent to some convex polytope
,  proved that there is a relation between the number of lattice point on a sphere and the volume of it.
The point (Y1, Y2), governed by (18)-(19), can never leave the (N -1)-dimensional (here N = 3) convex polytope
and by definition [Y.sub.3] = 1 - [Y.sub.1] - [Y.sub.2].