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Added parallelogram identity since it was linked from type (functional analysis). Actually, I mostly stole the content from another wiki, (this one) but I don’t think that the original author will mind.
I would make sure by asking him! :-)
Maybe we should classify 2 into philosophy thread…on self-reflection…
I added a little result to parallelogram identity that I’ve always liked, and which seems to fit the overall theme.
Very nice. Yes, I think that does fit the theme.
Quite apart from where I stole the source from, I felt that either the page was going to be very short (“The parallelogram identity is …”) or it would have to take a slightly lower level approach. Being in a teach-y mood, I went for the latter.
What might be nice to do is to list other characterisations of Hilbert spaces. I came across a few others when I asked about this on MO a long, long time ago.
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