[Merged by Bors] - feat(linear_algebra/affine_space/affine_subspace): prove that a set whose affine span is top cannot be empty. #9113
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…hose affine span is top cannot be empty. The lemma `finset.card_sdiff_add_card` is unrelated but I've been meaning to add it and now seemed like a good time since I'm touching `data/finset/basic.lean` anyway.
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…hose affine span is top cannot be empty. (#9113) The lemma `finset.card_sdiff_add_card` is unrelated but I've been meaning to add it and now seemed like a good time since I'm touching `data/finset/basic.lean` anyway.
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The lemma
finset.card_sdiff_add_cardis unrelated but I've been meaning to add itand now seemed like a good time since I'm touching
data/finset/basic.leananyway.