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- W768096598 abstract "Given a simple connected graph i and a subset of its vertices C, the pseudodistance-regularity around C generalizes, for not necessarily regular graphs, the notion of completely regular code. Up to know, most of the characterizations of pseudodistance-regularity has been derived from a combinatorial deflnition. In this paper we propose an algebraic (Terwilliger-like) approach to this notion, showing its equivalence with the combinatorial one. This allows us to give new proofs of known results, and also to obtain new characterizations which do not depend on the so-called C-spectrum of i, but only on the positive eigenvector of its adjacency matrix. In the way, we also obtain some results relating the local spectra of a vertex set and its antipodal. As a consequence of our study, we obtain a new characterization of a completely regular code C, in terms of the number of walks in i with an endvertex in C." @default.
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- W768096598 date "2009-06-01" @default.
- W768096598 modified "2023-09-23" @default.
- W768096598 title "Combinatorial vs. algebraic characterizations of pseudo-distance-regularity around a set" @default.
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