The authors prove an annihilation result at u=1 for Artin-Ihara L-functions on abelian multigraph covers analogous to Brumer's conjecture and compute the index of an analogous Stickelberger ideal, plus observations on spanning trees.
Kuroda’s class number formula
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The special value $u=1$ of Artin-Ihara $L$-functions
The authors prove an annihilation result at u=1 for Artin-Ihara L-functions on abelian multigraph covers analogous to Brumer's conjecture and compute the index of an analogous Stickelberger ideal, plus observations on spanning trees.