Dado el conjunto A = {1, 2, 3, 4, 5, 6, 7, 8} con la relación orden: R1 = {(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (1, 7), (1, 8), (2, 2), (2, 5), (2, 6), (2, 8), (3, 3), (3, 5), (3, 7), (3, 8), (4, 4), (4, 6), (4, 7), (4, 8), (5, 5), (5, 8), (6, 6), (6, 8), (7, 7), (7, 8) }. *