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Reflexive Operator Algebra: Operator Algebra, Functional Analysis, Reflective Subcategory, Mathematics - Brossura

 
9786131245190: Reflexive Operator Algebra: Operator Algebra, Functional Analysis, Reflective Subcategory, Mathematics

Sinossi

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In functional analysis, a reflexive operator algebra A is an operator algebra that has enough invariant subspaces to characterize it. Formally, A is reflexive if it is equal to the algebra of bounded operators which leave invariant each subspace left invariant by every operator in A. This should not be confused with a reflexive space. Nest algebras are examples of reflexive operator algebras. In finite dimensions, these are simply algebras of all matrices of a given size whose nonzero entries lie in an upper-triangular pattern. In fact if we fix any pattern of entries in an n by n matrix containing the diagonal, then the set of all n by n matrices whose nonzero entries lie in this pattern forms a reflexive algebra.

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