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

$$f(x)=3a+x$$

• General syntax for symbols with a kind of lower and upper limits:

\symbolname_{<em>lowerexpression</em>}^{<em>upperexpression</em>}

• In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix.
• Syntax for the contour integral symbol:

$$$\bigoint_{0}^{\infty}$$$   gives  

$$\bigoint_{0}^{\infty}$$

and

$$$\oint_{0}^{\infty}$$$   gives 

$$\oint_{0}^{\infty}$$

• Use font size commands for a nicer picture:

$$$\LARGE\bigoint_{\small0}^{\small\infty}$$$   gives  

$$\LARGE\bigoint_{\small0}^{\small\infty}$$

and

$$$\large\oint_{\small0}^{\small\infty}$$$   gives 

$$\large\oint_{\small0}^{\small\infty}$$

• General syntax for symbols with a kind of lower and upper limits:

\symbolname_{<em>lowerexpression</em>}^{<em>upperexpression</em>}

• In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix.
• Note: mimeTeX seems currently only to support the \bigcoprod command.
• Syntax for coproduct symbol:

$$$\bigcoprod_{i=k}^{n}$$$   gives  

$$\bigcoprod_{i=k}^{n}$$

• Use font size commands for a nicer picture:

$$$\LARGE\bigcoprod_{\small{i=k}}^{\small~n}$$$   gives  

$$\LARGE\bigcoprod_{\small{i=k}}^{\small~n}$$