Is one that contains to all those polygons concave ordered of dato ( m, m, n ) m greater than n, n greater or equal to one, which are divided in congruent diamond or rhomboid congruent, also contains all parallelograms divided into ( m, 41 m order congruent parallelograms; m greater than or equal to two, and only if, they are divided into congruent rectangles rectangles or rhomboid divided at rhomboid congruent and through them is supposed that the ordered concave polygons are built is equal two respectively.
