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Oct 13, 2012 at 12:31 history edited J. M.'s missing motivation CC BY-SA 3.0
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Sep 7, 2012 at 0:16 history edited Mr.Wizard CC BY-SA 3.0
deleted 37 characters in body
Sep 1, 2012 at 19:57 comment added Mr.Wizard @J.M. good to know; thanks!
Aug 31, 2012 at 15:10 comment added J. M.'s missing motivation Didn't notice until now, but Inverse[{{x1 - x3, x2 - x3}, {y1 - y3, y2 - y3}}].(r - r3) is better done as LinearSolve[{{x1 - x3, x2 - x3}, {y1 - y3, y2 - y3}}, r - r3].
Aug 14, 2012 at 10:23 history edited Mr.Wizard CC BY-SA 3.0
deleted 8 characters in body; deleted 2 characters in body
Aug 14, 2012 at 10:18 history edited Mr.Wizard CC BY-SA 3.0
added 615 characters in body
Aug 14, 2012 at 10:02 history answered Mr.Wizard CC BY-SA 3.0