:: deftheorem Def2 defines -BitSubtracterCirc FSCIRC_2:def 2 :
for n being Nat
for x, y being FinSequence
for b₄ being strict gate`2=den Boolean Circuit of n -BitSubtracterStr (x,y) holds
( b₄ = n -BitSubtracterCirc (x,y) iff ex f, g, h being ManySortedSet of NAT st
( n -BitSubtracterStr (x,y) = f . n & b₄ = g . n & f . 0 = 1GateCircStr (<*>,((0 -tuples_on BOOLEAN) --> TRUE)) & g . 0 = 1GateCircuit (<*>,((0 -tuples_on BOOLEAN) --> TRUE)) & h . 0 = [<*>,((0 -tuples_on BOOLEAN) --> TRUE)] & ( for n being Nat
for S being non empty ManySortedSign
for A being non-empty MSAlgebra over S
for z being set st S = f . n & A = g . n & z = h . n holds
( f . (n + 1) = S +* (BitSubtracterWithBorrowStr ((x . (n + 1)),(y . (n + 1)),z)) & g . (n + 1) = A +* (BitSubtracterWithBorrowCirc ((x . (n + 1)),(y . (n + 1)),z)) & h . (n + 1) = BorrowOutput ((x . (n + 1)),(y . (n + 1)),z) ) ) ) );