Nonderogatory directed windmills.
Coalescence of difans and diwheels.
Nonderogatory unicyclic digraphs.
The higher-order matching polynomial of a graph.
Abelian groups which have trivial absolute coGalois group
In this article we characterize those abelian groups for which the coGalois group (associated to a torsion free cover) is equal to the identity.
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