LaTeX (pronounced "lah-TEK") is an open source document typesetting program. Users write in a markup language to describe how a document looks, then LaTeX applies the formatting based on those commands.
Commonly used when writing journal papers, theses, or dissertations, LaTeX can easily typeset mathematical equations, cross-reference figures, or change formatting from one column to two with a single argument.
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Type LaTeX code on the left, get live compiled output on the right.