For ghost-free pairs of generalised tree modules, homomorphisms are spanned by combinatorially defined generalised graph maps, yielding a sufficient condition for indecomposability.
Covering spaces in representation-theory
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Generalised tree modules: Hom-sets and indecomposability
For ghost-free pairs of generalised tree modules, homomorphisms are spanned by combinatorially defined generalised graph maps, yielding a sufficient condition for indecomposability.