The numerical range of an operator.
Embry, Mary R.
Pacific J. Math., Tome 35 (1970) no. 3, p. 647-650 / Harvested from Project Euclid
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Publié le : 1970-05-14
Classification:  47.10 
@article{1117559001,
     author = {Embry, Mary R.},
     title = {The numerical range of an operator.},
     journal = {Pacific J. Math.},
     volume = {35},
     number = {3},
     year = {1970},
     pages = { 647-650},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1117559001}
}

Embry, Mary R. The numerical range of an operator.. Pacific J. Math., Tome 35 (1970) no. 3, pp.  647-650. http://gdmltest.u-ga.fr/item/1117559001/