Geodesic
On Geršgorin-type problems and ovals of cassini
Electronic transactions on numerical analysis, Tome 8 (1999), pp. 15-20
Recently, two Ger$\check $sgorin-type matrix questions were raised. These are answered here, using ovals of Cassini.
Classification : 15A18
Keywords: ger$\check $sgorin circle theorem, ovals of Cassini 
@article{ETNA_1999__8__a9,
     author = {Varga,  Richard S. and Krautstengel,  Alan},
     title = {On {Ger\v{s}gorin-type} problems and ovals of cassini},
     journal = {Electronic transactions on numerical analysis},
     pages = {15--20},
     year = {1999},
     volume = {8},
     zbl = {0927.15008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_1999__8__a9/}
}
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Varga,  Richard S.; Krautstengel,  Alan. On Geršgorin-type problems and ovals of cassini. Electronic transactions on numerical analysis, Tome 8 (1999), pp. 15-20. http://geodesic.mathdoc.fr/item/ETNA_1999__8__a9/