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单词 InvariantSubspaceProblem
释义

invariant subspace problem


Initially formulated for Banach spacesMathworldPlanetmath, the invariant subspace conjecture stated the following:

Let X be a complex Banach space. Then every bounded operatorMathworldPlanetmathPlanetmath T in X has a non-trivial closed (http://planetmath.org/ClosedSet) invariant subspacePlanetmathPlanetmath, i.e. there exists a closed vector subspace SX such that S0, SX and T(S)S.

This conjecture was proven to be false when P. Enflo (1975) and . Read (1984) gave examples of bounded operators which did not have the above property.

However, if one considers only Hilbert spacesMathworldPlanetmath, this is still an open problem. Today the invariant subspace conjecture is formulated as follows:

Let H be a complex Hilbert space. Then every bounded operator T in H has a non-trivial invariant subspace, i.e. there exists a closed vector subspace SH such that S0, SH and T(S)S.

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更新时间:2025/5/4 16:09:31