theorem :: COMPUT_1:65

for i being Nat
for f1, f2 being non empty NAT * -defined to-naturals homogeneous Function st 1 <= i & i <= (arity f1) + 1 holds
for g being Element of HFuncs NAT st g is_primitive-recursively_expressed_by f1,f2,i holds
g = primrec (f1,f2,i)