theorem :: POLNOT_1:88
for L being non trivial Polish-language
for E being Polish-arity-function of L
for D being non empty set
for g being Polish-recursion-function of E,D
for K being Function of (Polish-WFF-set (L,E)),D
for t being Element of L
for F1, F2 being Polish-WFF of L,E st K is g -recursive & E . t = 2 holds
K . ((Polish-binOp (L,E,t)) . (F1,F2)) = g . (t,<*(K . F1),(K . F2)*>)