TeXeR

Texer is a $\text{\LaTeX}$ editor in AoPS. The link is https://artofproblemsolving.com/texer/

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There are 20 lines of additional crud prepending to the input before TeX rendering, meaning the line number in errors are 20 lines ahead of the actual line, e.g. an error on line 23 is actually an error on line 3.

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