Yurong Wu, Guoping Zhan
We consider the box dimension of the graphs of the generalized Riemann-type functions $G_δ(x)=\sum_{n=1}^{\infty}g(n^{2}x)n^{-1-δ}$ with 1-periodic real-valued continuous functions $g$ and $0<δ\le 1$. Firstly, we establish a rational-level non-vanishing criterion for the lower bound of lower box dimension of the graph of $G_δ$. More precisely, We prove that the lower bound $\dim_B(\mathrm{graph}\,G_δ)\ge\frac74-\frac\delta2$ under a mild decay condition of the Fourier coefficients of $g$ and non-vanishing of the square-class chirp functional $S_{d}(a;q)$ at a single rational $a/q$. A resolution theorem then asserts that for any nonconstant real trigonometric polynomial $g$, the chirp functional $S(a;q)$ cannot vanish at every rational simultaneously; consequently, $\dim_B(\mathrm{graph}\,G_δ)=\frac74-\frac\delta2$ for all such $g$ with $0<δ\le1$ which gives a negative answer to \cite[problem 2]{Wu-Zhan2026}. Finally, two guiding examples distinguish structural vanishing from genuinely arithmetic vanishing related to modular elliptic curve and governed by the Prime Number Theorem.