Hao Ma

collaborators

3 papers

math.AC2026

An Integrally Closed Reduced Ring with McCoy Localizations That Is Neither McCoy nor Locally a Domain

Haotian Ma

We construct an explicit commutative ring $R$ that is reduced and integrally closed, such that $R_{p}$ is an integrally closed McCoy ring for every maximal ideal $\mathfr…

math.AC2026

A Counterexample to Problem 19 on Integer-valued Polynomial Rings

Haotian Ma

We give a negative answer to Problem 19 of Cahen, Fontana, Frisch, and Glaz concerning the flatness and freeness of rings of integer-valued polynomials. We construct an explicit on…

math.CO2024

List-avoiding orientations

Peter Bradshaw, Yaobin Chen, Hao Ma +2

Given a graph $G$ with a set $F (v)$ of forbidden values at each $v \in V (G)$ , an $F$ -avoiding orientation of $G$ is an orientation in which $d e g^{+} (v) \neq \in F (v)$ for each vertex…