Edge reversal splits the Hashimoto operator into blocks whose Schur complement isolates a correction determinant and mixed-sector shadows that serve as new invariants separating certain cospectral irregular graphs.
Bass, The Ihara–Selberg zeta function of a tree lattice,Internat
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Beyond Bass Collapse: New Irregular Edge-Space Invariants in Ihara Theory
Edge reversal splits the Hashimoto operator into blocks whose Schur complement isolates a correction determinant and mixed-sector shadows that serve as new invariants separating certain cospectral irregular graphs.