theorem :: FACIRC_1:65

for x, y, c being object st c <> [<*x,y*>,'or'] holds
for s being State of (2GatesCircuit (x,y,c,'or'))
for a1, a2, a3 being Element of BOOLEAN st a1 = s . x & a2 = s . y & a3 = s . c holds
(Following (s,2)) . (2GatesCircOutput (x,y,c,'or')) = (a1 'or' a2) 'or' a3