arXiv subjects
Publications and source records attributed to Masa-Nori Ishida.
We describe the intersection complex of any perversity of a toric variety completely in terms of the associated fan. It is described by a finite complex of finite dimensional graded vector spaces which we call graded exterior modules. The intersection complexes of the middle perversity are treated in the second part following this article.
In the previous paper, we describe the intersection complexes of a toric variety as a finite complex of graded exterior modules on the associated fan. In this second part, we rewrite it explicitly by the barycentric subdivision of the fan. We get the decomposition theorem of the intersection homologies for a barycentric subdivision of a fan in the case of middle perversity. We get also the diagonal theorems I and II. These theorems give a new proof of the g-comnjecture on a simplicial polytope which was proved by R. Stanley.