2023/07/11 by Xiao, Stanley Yao, Yamagishi, Shuntaro
#FOS: Mathematics #Number Theory (math.NT)
paper · doi:10.48550/arxiv.2307.05712
In this paper, we prove that there does not exist F ∈ ℚ[x,y] of degree 4 such that F(ℤ2) = ℤ≥ 0. In particular, this answers a question by John S. Lew and Bjorn Poonen for quartic polynomials.