Averaging t-structures and extension closure of aisles
Averaging t-structures and extension closure of aisles
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平均 T 型结构和通道的延伸封闭
DOI:
10.1016/j.jalgebra.2013.07.007
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发表时间:
2012
影响因子:
0.9
通讯作者:
D. Ploog
中科院分区:
文献类型:
--
作者:
N.T. Broomhead;D. Pauksztello;D. Ploog
We ask when a finite set of t-structures in a triangulated category can be ‘averaged’ into one t-structure or, equivalently, when the extension closure of a finite set of aisles is again an aisle. There is a straightforward, positive answer for a (possibly infinite) set of compactly generated t-structures in a big triangulated category. For piecewise tame hereditary categories, we give a criterion for when averaging is possible, and an algorithm that computes truncation triangles in this case. A finite group action on a triangulated category gives a natural way of producing a finite set of t-structures out of a given one. If averaging is possible, there is an induced t-structure on the equivariant triangulated category.
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