On the constancy regions for mixed test ideals

[摘要] In this note we study the partition of R->= 0(n) given by the regions where the mixed test ideals tau(a(1)(t1) ... a(n)(tn)) are constant. We show that each region can be described as the preimage of a natural number under a p-fractal function phi : R->= 0(n) -> N. In addition, we give some examples illustrating that these regions do not need to be composed of finitely many rational polytopes. (C) 2013 Elsevier Inc. All rights reserved.

[发布日期] 2013-12-15

[关键词] Test ideals