Revision: 16546
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at August 7, 2009 12:54 by deepsoul
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\def\dblone{\hbox{$1\hskip -1.2pt\vrule depth 0pt height 1.6ex width 0.7pt \vrule depth 0pt height 0.3pt width 0.12em$}} % usage: \dblone
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A "1" with a double vertical stroke, sometimes used to denote a unit matrix.
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Unit matrix sign
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LaTeX