A classification of projectors
Gustavo Corach ; Alejandra Maestripieri ; Demetrio Stojanoff
Banach Center Publications, Tome 68 (2005), p. 145-160 / Harvested from The Polish Digital Mathematics Library
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A positive operator A and a closed subspace of a Hilbert space ℋ are called compatible if there exists a projector Q onto such that AQ = Q*A. Compatibility is shown to depend on the existence of certain decompositions of ℋ and the ranges of A and A1/2. It also depends on a certain angle between A() and the orthogonal of .

Publié le : 2005-01-01
EUDML-ID : urn:eudml:doc:281796 
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Gustavo Corach; Alejandra Maestripieri; Demetrio Stojanoff. A classification of projectors. Banach Center Publications, Tome 68 (2005) pp. 145-160. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc67-0-12/