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Linear Algebra and its Applications
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Pseudo-distance-regularized graphs are distance-regular or distance-biregular

Authors: Fiol, M.A.;

Pseudo-distance-regularized graphs are distance-regular or distance-biregular

Abstract

The concept of pseudo-distance-regularity around a vertex of a graph is a natural generalization, for non-regular graphs, of the standard distance-regularity around a vertex. In this note, we prove that a pseudo-distance-regular graph around each of its vertices is either distance-regular or distance-biregular. By using a combinatorial approach, the same conclusion was reached by Godsil and Shawe-Taylor for a distance-regular graph around each of its vertices. Thus, our proof, which is of an algebraic nature, can also be seen as an alternative demonstration of Godsil and Shawe-Taylor's theorem.

Keywords

Numerical Analysis, Algebra and Number Theory, Distance in graphs, predistance polynomials, Distance-biregular graph, Local spectrum, local spectrum, distance-biregular graph, Predistance polynomials, FOS: Mathematics, Discrete Mathematics and Combinatorics, Mathematics - Combinatorics, 05C50, 05E30, pseudo-distance-regular graph, Geometry and Topology, Combinatorics (math.CO), 05C50, Pseudo-distance-regular graph, 05E30

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
6
Average
Average
Average
Green
hybrid