theorem :: BVFUNC_6:134

for Y being non empty set
for a, b, c, d, e, f, g being Function of Y,BOOLEAN holds
( (((((a '&' b) '&' c) '&' d) '&' e) '&' f) '&' g '<' a & (((((a '&' b) '&' c) '&' d) '&' e) '&' f) '&' g '<' b ) by Lm6;