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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.

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# Mathematica: Delete constant term of f(z,w)

Can you offer guidance or do you also need help?

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