6 To create any polyhedron, first define the symbols used. Then use the polyhedron functions to define the constraints for the polyhedron. This example creates a square::
8 >>> x, y = symbols('x y')
9 >>> # define the constraints of the polyhedron
10 >>> square = Le(0, x) & Le(x, 2) & Le(0, y) & Le(y, 2)
12 >>> And(Ge(x, 0), Ge(-x + 2, 0), Ge(y, 0), Ge(-y + 2, 0))
14 Several unary operations can be performed on a polyhedron. For example: ::