Estimates for projections in Banach spaces and existence of direct complements
Gunther Dirr ; Vladimir Rakočević ; Harald K. Wimmer
Studia Mathematica, Tome 166 (2005), p. 211-216 / Harvested from The Polish Digital Mathematics Library
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Let W and L be complementary subspaces of a Banach space X and let P(W,L) denote the projection on W along L. We obtain a sufficient condition for a subspace M of X to be complementary to W and we derive estimates for the norm of P(W,L) - P(W,M).

Publié le : 2005-01-01
EUDML-ID : urn:eudml:doc:284413 
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Gunther Dirr; Vladimir Rakočević; Harald K. Wimmer. Estimates for projections in Banach spaces and existence of direct complements. Studia Mathematica, Tome 166 (2005) pp. 211-216. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm170-2-6/