Applies the function f, if maybeProof is \/-(proof) and one of formula{1,2} is present in polarity pol{1,2} in proof.
Applies the function f, if maybeProof is \/-(proof) and one of formula{1,2} is present in polarity pol{1,2} in proof.
Applies the function f, if maybeProof is \/-(proof) and formula is present in polarity pol in proof.
Applies the function f, if maybeProof is \/-(proof) and formula is present in polarity pol in proof.