The standard term seems to be ‘permutable’, for A(B(x)) = B(A(x)). One can also say these functions commute with respect to composition. This is slightly diffe

The standard term seems to be ‘permutable’, for A(B(x)) = B(A(x)). One can also say these functions commute with respect to composition. This is slightly different from the classical notion of commutativity, since the operator (composition) isn't generally commutative.