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Invariant subspace problem

 Home Mathematics Fields of mathematics Algebra Linear algebra Invariant subspaces
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The Invariant Subspace Problem is a significant open question in functional analysis, a branch of mathematics. It concerns the existence of invariant subspaces for bounded linear operators on a Hilbert space. Specifically, the problem asks whether every bounded linear operator on an infinite-dimensional separable Hilbert space has a non-trivial closed invariant subspace. An invariant subspace for an operator \( T \) is a subspace \( M \) such that \( T(M) \subseteq M \).

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