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Questions about the properties of vector spaces and linear transformations, including linear systems in general.

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Does $V \otimes V$ have non-trivial invariant subspaces under all unitaries of form $I \otim...

Let $V$ be a finite-dimensional complex vector space, and $U$ be any unitary that acts upon it. We want to investigate interesting subspaces of $V \otimes V$ which are invariant under all unitaries of …
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