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

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The eigenfunctions of an operator commuting with all rotations.

When reading the paper E. Carlen, J. Geronimo & M. Loss: SIAM J. MATH. ANAL., vol. 40, no. 1, 327-374 I found an argument like the following. Given an bounded and self-adjoint linear operator $K: …
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