from R[x0, . . . , xn−1, xn], we have f(x1, . . . , xn−1, w) = 0 and it follows that f
is a multiple of xn − w = x1 + . . . + xn − a. On the other hand, f contains at
most n monomials. Hence, by the next lemma, f = 0 and we have
from R[x0, . . . , xn−1, xn], we have f(x1, . . . , xn−1, w) = 0 and it follows that fis a multiple of xn − w = x1 + . . . + xn − a. On the other hand, f contains atmost n monomials. Hence, by the next lemma, f = 0 and we have
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