On the numerical range of a bounded operator.
Donoghue, William F.
Michigan Math. J., Tome 4 (1957) no. 2, p. 261-263 / Harvested from Project Euclid
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Publié le : 1957-05-14
Classification:  46.00 
@article{1028997958,
     author = {Donoghue, William F.},
     title = {On the numerical range of a bounded operator.},
     journal = {Michigan Math. J.},
     volume = {4},
     number = {2},
     year = {1957},
     pages = { 261-263},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1028997958}
}

Donoghue, William F. On the numerical range of a bounded operator.. Michigan Math. J., Tome 4 (1957) no. 2, pp.  261-263. http://gdmltest.u-ga.fr/item/1028997958/