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when toggle format what by license comment
Jul 7, 2013 at 7:20 comment added Federico Poloni There is no standard symbol for it, so, whatever the OP decides to use, they'd better define it in their paper.
Jul 7, 2013 at 3:16 comment added Nik Weaver And in words, "the positive part of $M_n({\bf R})$".
Jul 7, 2013 at 0:09 history edited user9072 CC BY-SA 3.0
MathJax
Nov 5, 2009 at 9:10 history answered Jonas Meyer CC BY-SA 2.5