Some relative stable categories are compactly generated

Details Some relative stable categories are compactly generated Some relative stable categories are compactly generated

2008-08-22

arxiv.org/abs/0808.3119v1

Mathematics

Group Theory

5 pages

Scientific paper

Let G be a finite group. The stable module category of G has been applied extensively in group representation theory. In particular, it has been used to great effect that it is a triangulated category which is compactly generated. Let H be a subgroup of G. It is possible to define a stable module category of G relative to H. It too is a triangulated category, but no non-trivial examples have been known where this relative stable category was compactly generated. We show here that the relative stable category is compactly generated if the group algebra of H has finite representation type. In characteristic p, this is equivalent to the Sylow p-subgroups of H being cyclic.

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