By Horst Sachs
The speculation of graph spectra can, in a fashion, be regarded as an try to make the most of linear algebra together with, particularly, the well-developed idea of matrices for the needs of graph idea and its purposes. even though, that doesn't suggest that the speculation of graph spectra might be decreased to the speculation of matrices; to the contrary, it has its personal attribute gains and particular methods of reasoning totally justifying it to be taken care of as a thought in its personal correct.
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