Power2[x, y] represents x^y. Sometimes Power2 is more useful than the Mathematica Power. Power2[-a,b] simplifies to (-1)^b Power2[a,b] (if no Epsilon is in b …).
Power2[x, y]
x^y
Power2
Power
Power2[-a,b]
(-1)^b Power2[a,b]
Epsilon
b
Overview, PowerFactor.
Power[-a, b]
(-a)^b
Power2[-a, b]
(-1)^b a^b