Browse the glossary using this index
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tau (lower case greek letter) $$\tau$$ gives 

TeX notation allows for the expression of ASCII characters to generate formatted graphics output 

theta (lower case greek letter) $$\theta$$ gives 

Theta (upper case greek letter) $$\Theta$$ gives 

times $$a\times~b$$ gives 

triangle $$\triangle~abc$$ gives 

triggering the TeX filter  Two double $'s embracing a valid math expression trigger the filter to generate and insert the formula gif.
 Ex.: $$a^2$$ produces

