The closure of the numerical range contains the spectrum
Zarantonello, Eduardo H.
Bull. Amer. Math. Soc., Tome 70 (1964) no. 6, p. 781-787 / Harvested from Project Euclid
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Publié le : 1964-11-14
Classification:  
@article{1183526333,
     author = {Zarantonello, Eduardo H.},
     title = {The closure of the numerical range contains the spectrum},
     journal = {Bull. Amer. Math. Soc.},
     volume = {70},
     number = {6},
     year = {1964},
     pages = { 781-787},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183526333}
}

Zarantonello, Eduardo H. The closure of the numerical range contains the spectrum. Bull. Amer. Math. Soc., Tome 70 (1964) no. 6, pp.  781-787. http://gdmltest.u-ga.fr/item/1183526333/