 Given an formula_9-simplex formula_7 with vertices formula_11, for formula_12, let formula_13 be the set consisting of all formula_14-dimensional subsimplexe of formula_7.For any formula_16, let formula_17 denote its measure, and let formula_18 be its unit outer normals which are linearly independent.For formula_19, any formula_14-dimensional
subsimplex formula_21 and formula_22 with formula_23, define 

The degrees of freedom are depicted in Table 1.