I have a polynomial ring R = k[x1, x2, ..., xn] and a ring homomorphism f: R -> R. In case it matters, k=GF(2). I would like to find the subring of elements x satisfying f(x) = x: that is, I want to find the equalizer of the pair of maps (f, 1). Is there anything in Sage that will compute this? The more polynomial generators this can handle, the better.
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