mathlib
8cfa8363 - feat(analysis/inner_product_space/l2_space): if `K` is a complete submodule then `E` is the Hilbert sum of `K` and `Kᗮ` (#15792)

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3 years ago
feat(analysis/inner_product_space/l2_space): if `K` is a complete submodule then `E` is the Hilbert sum of `K` and `Kᗮ` (#15792)
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