Applying techniques similar to Combinatorial Nullstellensatz we prove a lower estimate of |f(A,B)| for finite subsets A, B of a field, and a polynomial f(x,y) of the form f(x,y) = g(x) + yh(x), where the degree of g is greater than that of h.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa165-3-6,
author = {Fedor Petrov},
title = {Combinatorial Nullstellensatz approach to polynomial expansion},
journal = {Acta Arithmetica},
volume = {166},
year = {2014},
pages = {279-282},
zbl = {1328.12003},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa165-3-6}
}
Fedor Petrov. Combinatorial Nullstellensatz approach to polynomial expansion. Acta Arithmetica, Tome 166 (2014) pp. 279-282. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa165-3-6/