Moodle TeX Filter Glossary
escaping the TeX filter:  With two triple $'s embracing an expression you can make the filter to escape and the code itself is shown (with two embracing double $'s).
 Ex.: $$$a^2$$$ produces $$a^2$$, i.e. prevents the filter to render it as a formula gif.

Keyword(s): 

mathematics expression:  A valid expression inside the $'s is rendered as mathematics in an inserted gif image.
 Ex.: $$x=y^2$$ creates

Keyword(s): 

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

Keyword(s): 

arithmetic operations:  Type arithmetic operations and "=" as usual.
 Exp.: $$f(x)=x2b+(3a/c)$$ gives
 See also keyword "fraction" for extended capabilities.


constants:  Numbers in formulas are interpreted as constants and they are rendered in nonitalic roman font face, which is a widely used convention.
 Following this convention, variables are shown in italic.
 Exp.: $$f(x)=3a+x$$ gives


fraction:  Syntax: \frac{numerator}{denominator}
 Use font sizing commands for specific sizing if you don't want the predefined one to be taken.
 Ex. (with predefined sizing): $$f(x,y)=\frac{2a}{x+y}$$ gives
 Ex. (with specific sizing): $$f(x,y)=\frac{\fs{2}2a}{\fs{2}x+y}$$ gives
 You may nest fractions as much as you want.
 Ex. (nested fractions): $$\frac{\frac{a}{xy}+\frac{b}{x+y}}{1+\frac{ab}{a+b}}$$ gives


multiplication (with cdot): $$a\cdot~b$$ gives 

root:  Syntax: \sqrt[n]{arg} or simply \sqrt{arg} for \sqrt[2]{arg}
 Ex.: $$\sqrt[3]{8}$$ gives
 Nesting of roots (and combining with fractions, ...etc.) are possible.
 Ex.: $$\sqrt[n]{\frac{x^ny^n}{1+u^{2n}}}$$ gives
 Ex.: $$\sqrt[3]{q+\sqrt{q^2+p^3}}$$ gives


square root:  $$\sqrt{a}$$ or $$\sqrt~a$$ gives
 Use braces for terms with more than one character: $$\sqrt{x+y}$$ gives


subscript:  The command character "_" triggers subscription of the following expression(s).
 For more than one subscripted character put them in braces {...}.
 Use font sizing commands for appropriate sizing.
 Ex.:$$x_1$$ gives
 Ex. (with specific sizing): $$x_{\small1}=a_{\small{m+2n}}$$ gives
 Combine subscripting with superscripting (command character "^").
Syntax: Expr_{subExpr}^{supExpr}.  Ex.: $$A_{\small{i,j,k}}^{\small{n+2}}$$ gives

