Hi, I have a messy expression as a polynomial in z and w: a+bz+czw+dz^2w+...+kz^n w^m How can I delete the constant "a" term? Here's the function. The constant terms are dispersed throughout the expression. I know I can extract the coefficient list first in w then in z to actually get the constant expression but I don't know how to remove it from the expression: Edit: Ok, that was dumb. Just use Coefficient to get at it then just subtract it out. Sorry. Can't delete it. Nevermind.