### Abstract

Original language | English |
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Place of Publication | Ithaca |

Publisher | Cornell University Library |

Number of pages | 10 |

Publication status | Published - 30 Oct 2018 |

### Publication series

Name | arXiv |
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Volume | 1810.12615 |

### Fingerprint

### Cite this

*On the spectral characterization of mixed extensions of P3*. (arXiv; Vol. 1810.12615). Ithaca: Cornell University Library.

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**On the spectral characterization of mixed extensions of P3.** / Haemers, Willem H.; Sorgun, Sezer; Topcu, Hatice.

Research output: Working paper › Other research output

TY - UNPB

T1 - On the spectral characterization of mixed extensions of P3

AU - Haemers, Willem H.

AU - Sorgun, Sezer

AU - Topcu, Hatice

PY - 2018/10/30

Y1 - 2018/10/30

N2 - A mixed extension of a graph G is a graph H obtained from G by replacing each vertex of G by a clique or a coclique, whilst two vertices in H corresponding to distinct vertices x and y of G are adjacent whenever x and y are adjacent in G. If G is the path P3, then H has at most three adjacency eigenvalues unequal to 0 and -1. Recently, the first author classified the graphs with the mentioned eigenvalue property. Using this classification we investigate mixed extension of P3 on being determined by the adjacency spectrum. We present several cospectral families, and with the help of a computer we find all graphs on at most 25 vertices that are cospectral with a mixed extension of P3.

AB - A mixed extension of a graph G is a graph H obtained from G by replacing each vertex of G by a clique or a coclique, whilst two vertices in H corresponding to distinct vertices x and y of G are adjacent whenever x and y are adjacent in G. If G is the path P3, then H has at most three adjacency eigenvalues unequal to 0 and -1. Recently, the first author classified the graphs with the mentioned eigenvalue property. Using this classification we investigate mixed extension of P3 on being determined by the adjacency spectrum. We present several cospectral families, and with the help of a computer we find all graphs on at most 25 vertices that are cospectral with a mixed extension of P3.

M3 - Working paper

T3 - arXiv

BT - On the spectral characterization of mixed extensions of P3

PB - Cornell University Library

CY - Ithaca

ER -