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List of forum topicsenFundamental and trivial question on triangle inequality.
http://mathforum.org/kb/thread.jspa?messageID=7521502&tstart=0#7521502
It's well known (e.g Recent Advances in Geometric]]>Aug 16, 2011 4:24:46 AMAug 16, 2011 4:24:46 AMChessTal0