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May 19, 2015 at 11:02 history edited User981636 CC BY-SA 3.0
added 2 characters in body
May 18, 2015 at 19:01 vote accept User981636
May 18, 2015 at 17:50 answer added egreg timeline score: 17
May 18, 2015 at 17:38 comment added egreg \left[ and \right]. The characters { and } are special, so the must be escaped for getting printed braces, but [ and ] aren't special. However, with the package amsmath you can simply type \begin{bmatrix} 1& 5 & 8 & a \\...\end{bmatrix}.
May 18, 2015 at 17:37 history asked User981636 CC BY-SA 3.0