Your function f is never close to 0.1, it being smallest at (0,0), so there are no solutions to Eq(f(x,y),0.1) or f⩵ 0.1. Try again, with a bigger value?
Your function f is never close to 0.1, it being smallest at (0,0), so there are no solutions to Eq(f(x,y),0.1) or f⩵ 0.1. Try again, with a bigger value?