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Simply use \Dashv from mathabx package. You can find almost any symbol in The comprehensive LaTeX Symbol List.


Perhaps it's not the most beautiful TeX code, but the following produces a beautiful nonforking symbol ($A \ind_C B$) and an even more beautiful placement of the slash in the forking symbol ($A \nind_C B$). \def\Ind#1#2{#1\setbox0=\hbox{$#1x$}\kern\wd0\hbox to 0pt{\hss$#1\mid$\hss} \lower.9\ht0\hbox to 0pt{\hss$#1\smile$\hss}\kern\wd0} ...

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