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A complete characterization of bidegreed split graphs with four distinct signless Laplacian eigenvalues.
- Source :
-
Linear Algebra & its Applications . Nov2021, Vol. 629, p232-245. 14p. - Publication Year :
- 2021
-
Abstract
- It is a well-known fact that a graph of diameter d has at least d + 1 eigenvalues (A.E. Brouwer, W.H. Haemers (2012) [2]). A graph is d -extremal (resp. d S L -extremal) if it has diameter d and exactly d + 1 distinct eigenvalues (resp. signless Laplacian eigenvalues), and a graph is split if its vertex set can be partitioned into a clique and a stable set. Such graphs have diameter at most three. If all vertex degrees in a split graph are either d ˜ or d ˆ , then we say it is (d ˜ , d ˆ) -bidegreed. In this paper, we present a complete classification of the connected bidegreed 3 S L -extremal split graphs using the association of split graphs with combinatorial designs. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EIGENVALUES
*LAPLACIAN matrices
Subjects
Details
- Language :
- English
- ISSN :
- 00243795
- Volume :
- 629
- Database :
- Academic Search Index
- Journal :
- Linear Algebra & its Applications
- Publication Type :
- Academic Journal
- Accession number :
- 152204488
- Full Text :
- https://doi.org/10.1016/j.laa.2021.08.006