 Vertex of an indecomposable module (source code)

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= Vertex of an indecomposable module

= Vertices of an indecomposable module
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= Module vertex
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A vertex of an indecomposable $kG$-module is a <subgroup> minimal among those for which the <module> is relatively projective. Vertices exist, form one <conjugacy class>, and are p-groups when $k$ has characteristic $p$. The vertices of the trivial <module> are the Sylow p-subgroups.

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