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As said in the comment, $I_+ is already the solution. This seems also be working with MathJax using a demo page of MathJax:


Here's a comparison; note that you should always avoid fractions in one of the arguments to \binom (which is preferred over the infix \choose). \documentclass{article} \usepackage{amsmath} \begin{document} Bad Text style: $\binom{n}{\lfloor \frac{n}{2}\rfloor}$ Display: $\displaystyle\binom{n}{\lfloor \frac{n}{2}\rfloor}$ Good Text style: ...


As noted before, a true syntax checker for LaTeX (or any other TeX format) is strictly impossible due to TeX's Turing-completeness. However, you can find the most common errors with the lacheck script, included in your TeX distribution.

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