Is -1/sqrt3 wrong? It's smaller than -1/3. --Rich --- Quoting Gareth McCaughan <gareth.mccaughan@pobox.com>:
On 04/11/2015 23:37, Dan Asimov wrote:
Though I would add that only R^3 is necessary to find the maximum common angular separation of 4 vectors.
Taking every other vertex of the cube [-1,1]^3 gets an example.
I came very close to just writing "Obviously it's -1/3 because the right picture is a regular tetrahedron" but thought that might be not quite rigorous enough :-).
(Not quite rigorous enough to be sure I wasn't completely wrong, as well as not quite rigorous enough to satisfy Dan.)
-- g
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