Jangwon Ju

Tight universal octagonal forms

2022 · arXiv (Cornell University)

Let $P_8(x)=3x^2-2x$. For positive integers $a_1,a_2,\dots,a_k$, a polynomial of the form $a_1P_8(x_1)+a_2P_8(x_2)+\cdots+a_kP_8(x_k)$ is called an octagonal form. For a positive integer $n$, an octagonal form is called tight $\mathcal T(n)$-universal if it represents (over $\mathbb{z}$) …