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

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A differentiable one-parameter family of codimension 2 subspaces of $\mathbb{C}^n$ cannot fi...

I assume $P$ varies analytically as in the body of the question, I do not know how to tackle the case where $P$ is just differentiable, I also read rank 2 as real rank though of course the problem is …
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