How to convert the $\LaTeX$ format to Mathematica input?
For example, if I have a formula:
$$ \sum_{m_{i}=0}^M\sum_{n_{j}=0}^N \frac{(z_{i}/2)^{m_{i}}(z_{j}/2)^{n_{j}}}{m!n!} $$
in terms of $\LaTeX$ format:
\sum_{m_{i}=0}^M\sum_{n_{j}=0}^N \frac{(z_{i}/2)^{m_{i}}(z_{j}/2)^{n_{j}}}{m!n!}
How would we convert it to Mathematica input?