theorem Th80: :: REWRITE3:80

for x, y1, y2, z being object
for E being non empty set
for F being Subset of (E ^omega)
for TS being non empty transition-system over F st TS is deterministic & ==>.-relation TS reduces x,[y1,z] & ==>.-relation TS reduces x,[y2,z] holds
y1 = y2