Hey guys, I have the following function
f[x_, y_ ] =
Piecewise[{{x^2/y^(-4)*Exp[-(x^2/y^(-4)], y != 0}, {0,y = 0}}]
Mathematica's output is just a simple 0. For an unknown reason Mathematica "thinks" that y=0. Anybody an idea how I could fix this? I have honestly no idea where the problem could be.