theorem Th30: :: GENEALG1:30
for n1, n2, n3, n4 being Element of NAT
for S being Gene-Set
for p1, p2 being Individual of S holds
( crossover (p1,p2,0,0,n3,n4) = crossover (p1,p2,n3,n4) & crossover (p1,p2,0,n2,0,n4) = crossover (p1,p2,n2,n4) & crossover (p1,p2,0,n2,n3,0) = crossover (p1,p2,n2,n3) & crossover (p1,p2,n1,0,n3,0) = crossover (p1,p2,n1,n3) & crossover (p1,p2,n1,0,0,n4) = crossover (p1,p2,n1,n4) & crossover (p1,p2,n1,n2,0,0) = crossover (p1,p2,n1,n2) )