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Mar 10, 2022 at 20:09 history edited The Amplitwist CC BY-SA 4.0
fixed broken link (since this thread is already bumped), adjusted MathJax, corrected typo
Jul 6, 2011 at 10:23 comment added Federico Poloni Doesn't this "richer" statement follow easily from the law of cosines?
Nov 17, 2010 at 14:08 comment added darij grinberg I don't think this is any news to most mathematicians. This is even in some good German schoolbooks from the 1960's-70's. Often when there is a statement like "if $a=b$ then $c=d$" one could check whether $a\leq b$ implies $c\leq d$, and lots of geometric inequalities have been created this way from identities.
Sep 3, 2010 at 15:59 history answered Hans-Peter Stricker CC BY-SA 2.5