th0114nd 4ee73a124c Changed LaTex $\bot$s to ⊥
In the HTML version of the documentation, it isn't rendered so might as well use the unicode representation.
Part of the problem was that putting a math unicode character wasn't
rendering properly in the pdf, so extra steps were needed to define
the unicode charecter ⊥ in reference.tex

closes #15285
2014-12-19 18:09:33 -05:00
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