The multiplicity of an operator is a special case of the topological degree for $k$ -set contractions
Thomas, J. W.
Duke Math. J., Tome 40 (1973) no. 1, p. 233-240 / Harvested from Project Euclid
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Publié le : 1973-06-14
Classification:  47H10,  54H25 
@article{1077309714,
     author = {Thomas, J. W.},
     title = {The multiplicity of an operator is a special case of the
 topological degree for $k$ -set contractions},
     journal = {Duke Math. J.},
     volume = {40},
     number = {1},
     year = {1973},
     pages = { 233-240},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077309714}
}

Thomas, J. W. The multiplicity of an operator is a special case of the
 topological degree for $k$ -set contractions. Duke Math. J., Tome 40 (1973) no. 1, pp.  233-240. http://gdmltest.u-ga.fr/item/1077309714/