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About: Douglas' lemma     Goto   Sponge   NotDistinct   Permalink

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In operator theory, an area of mathematics, Douglas' lemma relates factorization, range inclusion, and majorization of Hilbert space operators. It is generally attributed to Ronald G. Douglas, although Douglas acknowledges that aspects of the result may already have been known. The statement of the result is as follows: Theorem: If and are bounded operators on a Hilbert space , the following are equivalent: 1. * 2. * for some 3. * There exists a bounded operator on such that . Moreover, if these equivalent conditions hold, then there is a unique operator such that * * * .