## A Combinatorial Object

#### Pappus Graph

**Vertices:** 18

**Edges:** 27

**Radius:** 4

**Diameter:** 4

**Girth:** 6

**Automorphisms:**

216

**Chromatic number:** 2

**Chromatic index:** 3

**Properties:**

Symmetric, Distance-transitive, Distance-regular, Cubic, Hamiltonian

Publications

**G.R. Omidi and M. Shahsiah, **

*Diagonal Ramsey numbers of loose cycles in uniform hypergraphs*

#### SIAM J. Discrete Math. (to appear)

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**G. R. Omidi (Joint with L. Maherani), **

*Monochromatic Hamiltonian Berge-cycles in colored hypergraphs*

#### Discrete Math. (to appear)

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**A. Abdollahi (Joint with Sh. Janbaz and M. Ghahramani), **

*A large family of cospectral cayley graphs over dihedral groups*

#### Discrete Math. (to appear)

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**M. R. Oboudi, **

*Energy and Seidel energy of graphs*

#### MATCH Communications in Mathematical and in Computer Chemistry 75(2016), 291-303

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**M. R. Oboudi, **

*On the third largest eigenvalue of graphs*

#### Linear Algebra Appl. 503(2016), 164-179

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**M. R. Oboudi, **

*Cospectrality of complete bipartite graphs*

#### Linear Multilinear Algebra (2016), DOI: 10.1080/03081087.2016.1162133

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**M. R. Oboudi, **

*Bipartite graphs with at most six non-zero eigenvalues*

#### Ars Mathematica Contemporanea 11(2016), 315-325

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**A. Abdollahi and M. Jazaeri (Joint with E. R. van Dam), **

*Distance-regular graphs with least eigenvalue-2*

#### Des. Codes Cryptogr. (2016), DOI: 10.1007/s10623-016-0209-4

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**E. Ghorbani, **

*Proof of a conjecture on `plateaux' phenomenon of graph Laplacian eigenvalues*

#### Linear Algebra Appl. 506(2016), 274-278

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**E. Ghorbani, **

*Nontrivial nuciferous graphs exist*

#### Ars Mathematica Contemporanea 11(2016), 391-395

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**E. Ghorbani, **

*On eigenvalues of Seidel matrices and Haemers' conjecture*

#### Des. Codes Cryptogr. (2016), DOI: 10.1007/s10623-016-0248-x

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**S. Saeedi Madani and D. Kiani, **

*Cohen-Macaulay and Gorenstein path ideals of trees*

#### Algebra Colloq. 23(2016), 469-480

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**F. Ramezani (Joint with M. Tale Masouleh), **

*Matching in Toeplitz graphs*

#### Ars Combin. (to appear)

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**S. Akbari and S. Zare (Joint with M. Kano), **

*0-sum and 1-sum flows in regular graphs*

#### Electron. J. Combin. 23(2016), #P2.37

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**M. R. Oboudi , **

*On the roots of domination polynomial of graphs*

#### Discrete Appl. Math. 205(2016), 126-131

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