[Merged by Bors] - feat(analysis/normed_space/inner_product): isometry of ℂ with Euclidean space #6877
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…an space (#6877) `ℂ` is isometric to `fin 2 → ℝ` with the Euclidean inner product. The isometry given here is that defined by the ordered basis {1, i} for `ℂ`.
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…an space (#6877) `ℂ` is isometric to `fin 2 → ℝ` with the Euclidean inner product. The isometry given here is that defined by the ordered basis {1, i} for `ℂ`.
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ℂis isometric tofin 2 → ℝwith the Euclidean inner product. The isometry given here is that defined by the ordered basis {1, i} forℂ.https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/.60inner_product_space.20.E2.84.9D.20%28euclidean_space.20.F0.9D.95.9C.20n%29.60.3F/near/230766844