Inner product spaces #1705
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Inner product spaces #1705
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…shake-out-signed-rational
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Co-authored-by: Fredrik Bakke <fredrbak@gmail.com>
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…gda.md Co-authored-by: Fredrik Bakke <fredrbak@gmail.com>
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…aces.lagda.md Co-authored-by: Fredrik Bakke <fredrbak@gmail.com>
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Includes the Pythagorean theorem. Completes #1691.
Builds on #1704 , but doesn't actually connect yet -- that'll require a proof of Cauchy-Schwarz, which I am trying to figure out; Wikipedia's proofs lean on excluded middle and I haven't yet figured out how to sidestep that.