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Questions about the branch of combinatorics called graph theory (not to be used for questions concerning the graph of a function). This tag can be further specialized via using it in combination with more specialized tags such as extremal-graph-theory, spectral-graph-theory, algebraic-graph-theory, topological-graph-theory, random-graphs, graph-colorings and several others.

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Can the corollary of the Ihara–Bass formula be extended to $ u^2 = 1 $?

(I don't have enough reputation to comment). There are generalizations of Ihara-Bass result for adjacency matrix $A$ with $A_{ij}$ being some real number(see this paper, p. 13 and further). But even t …
Daniele Tampieri's user avatar