theorem Th70: :: EXCHSORT:70

for O being non empty connected Poset
for T being non empty array of O
for p, q, s being Element of dom T st p in q & q in s holds
( ((T,p,q) incl) . (p,s) = [q,s] & ((T,p,q) incl) . (q,s) = [p,s] )