To write formulas please use LaTeX. Write [latexpage] before writing a formula.
Example
[latexpage]
$W_t = W_0 \exp{(rt)}$
will result in
[latexpage]
$W_t = W_0 \exp{(rt)}$
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To write code please use CODE button (from the menu below Topic Title)
#R-code to plot a path of the Wiener Process
wienerProcess = cumsum(rnorm(100,0,1))
ts.plot(wienerProcess)
We are going to add support for SyntaxHighlighter later.