Geodesic
Sudoku graphs are integral
The electronic journal of combinatorics, Tome 16 (2009) no. 1
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Sudoku graphs have only 5 or 6 distinct eigenvalues and all of them are integers. Moreover, the associated eigenspaces admit bases with entries from the set $\{0, 1, -1\}$.
DOI : 10.37236/263
Classification : 05C50, 15A18
Mots-clés : sudoku graphs, eigenvalue, eigenspaces, integral graph, graph spectrum 
@article{10_37236_263,
     author = {Torsten Sander},
     title = {Sudoku graphs are integral},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/263},
     zbl = {1185.05100},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/263/}
}
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Torsten Sander. Sudoku graphs are integral. The electronic journal of combinatorics, Tome 16 (2009) no. 1. doi: 10.37236/263

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