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## Issues with nested begin..end blocks in inline math environments

 From: Matt Huszagh Subject: Issues with nested begin..end blocks in inline math environments Date: Fri, 6 Dec 2019 11:42:40 -0800

I'm experiencing incorrect and seemingly inconsistent behavior when nesting \begin \end environments inside  or . For example, the following is valid latex code:

\begin{aligned} b_n &= \frac{1}{\pi} \int_{0}^{\pi} x \sin{\left(nx\right)}dx \\ b_0 &= 0 \\ \int_{0}^{\pi} udv &= \left[uv\right]_{0}^{\pi} - \int_{0}^{\pi} vdu \\ dv &= \sin{\left(nx\right)}dx \\ v(x) &= \int \sin{\left(nx\right)}dx \\ &= -\frac{\cos{\left(nx\right)}}{n} \\ \left[uv\right]_{0}^{\pi} &= -\left[\frac{x\cos{\left(nx\right)}}{n}\right]_{0}^{\pi} \\ &= \left\{\begin{alignedat}{2} \frac{\pi}{n}&, && \quad \text{n odd} \\ -\frac{\pi}{n}&, && \quad \text{n positive even} \\ \end{alignedat}\right. \\ \int_{0}^{\pi} vdu &= \int_{0}^{\pi} -\frac{\cos{\left(nx\right)}}{n} dx \\ &= -\frac{1}{n^2} \left.\sin{\left(nx\right)}\right|_{0}^{\pi} \\ &= 0 \\ b_{n\in \mathbb{Z}^+} &= \left\{\begin{alignedat}{2} \frac{1}{n}&, && \quad \text{n odd} \\ -\frac{1}{n}&, && \quad \text{n positive even} \\ \end{alignedat}\right. \\ \end{aligned}

But this confuses org which is generating images for the \begin{aligned} at the top and the \text macros, but nothing else. Iterations on this sometimes work fine, however. For example,

\begin{aligned} b_{n\in \mathbb{Z}^+} &= \left\{\begin{alignedat}{2} \frac{1}{n}&, && \quad \text{n odd} \\ -\frac{1}{n}&, && \quad \text{n positive even} \\ \end{alignedat}\right. \\ \end{aligned}

typesets correctly. Has anyone else had trouble with the latex fragment regex's?