theorem Th95: :: SHEFFER2:95

for L being non empty satisfying_Sheffer_1 satisfying_Sheffer_2 satisfying_Sheffer_3 ShefferStr
for w, p being Element of L holds (p | p) | (p | (w | (w | w))) = ((w | w) | p) | (((w | w) | (w | w)) | p)