The integral cohomology rings of four-dimensional toric orbifolds

Abstract

Let $X(P,λ)$ be a 4-dimensional toric orbifold associated to a polygon $P$ and a characteristic function $λ$. Assuming that $X(P,λ)$ is locally smooth over a vertex of $P$, we determine the integral cohomology ring $H^*(X(P,λ);\Z)$ by constructing an explicit basis and expressing the cup products of the basis elements in terms of $P$ and $λ$.