postulado 46, poligonos concavos ordenados 23
Of any parallelogram divided into parallelograms consistent from order ( m, r ) m greater than r, r greater than or equal to two, are built r-1 ordered concave polygons of data: ( m, r, 41 1; ( m, r, 2 ) ( m, r, 3 )... ( m, r, r-1 )