A more direct proof of Gerschgorin ’ s theorem

@inproceedings{Gmez2007AMD,
  title={A more direct proof of Gerschgorin ’ s theorem},
  author={Danny G{\'o}mez},
  year={2007}
}
The aim of this paper is to show a different presentation of the classical proof of the first part of Gerschgorin’s theorem. Besides for the second part of this theorem, there is a more straightforward and understandable proof than the one given on most of the classical books. 

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