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arXiv 1909.08262math.AG
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凸集代数与环面b-Chow群

The convex-set algebra and the toric b-Chow group

Ana Maria Botero

摘要:

在\cite{botero}中,定义了复曲面b-因子在光滑完备复曲面簇上的顶交积.证明了一个新复曲面b-因子对应于一个凸集,且它的顶相交数等于这个凸集的体积.本文的目标是扩展这一结果并定义任意余维的充分正复曲面b类的交集。为此,我们将McMullen的多胞形代数(\cite{McM1},\cite{McM2},\cite{McM3})推广到所谓的\emph{convex-set algebra},并证明了它嵌入环面b-Chow群.这样,凸集代数可以看作是充分正环面b-类的相交理论的环。作为应用,我们证明了凸集代数满足一些Hodge型不等式.

英文摘要:

In \cite{botero}, a top intersection product of toric b-divisors on a smooth complete toric variety is defined. It is shown that a nef toric b-divisor corresponds to a convex set and that its top intersection number equals the volume of this convex set. The goal of this article is to extend this result and define an intersection product of sufficiently positive toric b-classes of arbitrary codimension. For this, we extend the polytope algebra of McMullen (\cite{McM1}, \cite{McM2}, \cite{McM3}) to the so called \emph{convex-set algebra} and we show that it embeds in the toric b-Chow group. In this way, the convex-set algebra can be viewed as a ring for an intersection theory for sufficiently positive toric b-classes. As an application, we show that some Hodge type inequalities are satisfied for the convex-set algebra.

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