Polyhedra Circuits and Their Applications

We introduce polyhedra circuits. Each polyhedra circuit characterizes a geometric region in $mathbb{R}^d$. They can be applied to represent a rich class of geometric objects, which include all polyhedra and the union of a finite number of polyhedra. They can be used to approximate a large class of $d$-dimensional manifolds in $mathbb{R}^d$. Barvinok developed polynomial time algorithms to compute the volume of a rational polyhedra, and to count the number of lattice points in a rational polyhedra in a fixed dimensional space $mathbb{R}^d$ with a fix $d$. Define $T_V(d,, n)$ be the polynomial time in $n$ to compute the volume of one rational polyhedra, $T_L(d,, n)$ be the polynomial time in $n$ to count the number of lattice points in one rational polyhedra with $d$ be a fixed dimensional number, $T_I(d,, n)$ be the polynomial time in $n$ to solve integer linear programming time with $d$ be the fixed dimensional number, where $n$ is the total number of linear inequalities from input polyhedra. We develop algorithms to count the number of lattice points in the geometric region determined by a polyhedra circuit in $Oleft(ndcdot r_d(n)cdot T_V(d,, n)right)$ time and to compute the volume of the geometric region determined by a polyhedra circuit in $Oleft(ncdot r_d(n)cdot T_I(d,, n)+r_d(n)T_L(d,, n)right)$ time, where $n$ is the number of input linear inequalities, $d$ is number of variables and $r_d(n)$ be the maximal number of regions that $n$ linear inequalities with $d$ variables partition $mathbb{R}^d$.