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[Merged by Bors] - chore(analysis/normed_space/finite_dimension): golf a proof #13491
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These `letI`s just made this proof convoluted, the instances were not needed. Similarly, the `classical` was the cause of the need for the `congr`.
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These `letI`s just made this proof convoluted, the instances were not needed. Without them, we don't even need the import. Similarly, the `classical` was the cause of the need for the `congr`.
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These
letIs just made this proof convoluted, the instances were not needed.Without them, we don't even need the import.
Similarly, the
classicalwas the cause of the need for thecongr.