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About this paper
Snir Hordan, Nadav Dym, Tim Seppelt
The authors introduce PRiSM, which canonicalizes spectra by jointly resolving eigenvector signs and vertex order. They prove that for every k, non-isomorphic simple-spectrum multigraphs remain indistinguishable to k-WL, and give PRiSM a canonicalization guarantee for simple-spectrum eigendecompositions. On BREC, reported pipelines distinguish 212/360 pairs, versus 199/360 for MAP and OAP; the tables did not use the formal GF(2) solve.
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