(A, B)
return (A * B - B * A) / S(2)
Commutator of A and B divided by 2.
Commutator of A and B divided by 2.
Commutator of A and B divided by 2 .
def Com(A, B):
    "Commutator of A and B divided by 2."
    return (A * B - B * A) / S(2)
def Com ( A , B ) : return ( A * B - B * A ) / S ( 2 )