theorem Th32: :: FIB_NUM3:32

for a, b being Nat holds
( GenFib (a,b,0) = a & GenFib (a,b,1) = b & ( for n being Nat holds GenFib (a,b,((n + 1) + 1)) = (GenFib (a,b,n)) + (GenFib (a,b,(n + 1))) ) )