Hi,
I am relatively new to sublime text so maybe the problem I have is simple to solve.
Generally everything was working fine writing the Latex document until I closed and reopened sublime text.
Now I get undefined control sequence error for the code that compiled just fine 30 seconds ago.
For example in this code:
\begin{equation}
\begin{aligned}
&\mu=\sum\limit_{i=1}^N{\frac{x_i}{N}}\
&\sigma=\sqrt{\sum\limit_{i=1}^N{\frac{\left(x_i-\bar{x}\right)^2}{N}}}
\end{aligned}
\end{equation}
I get error “Undefined control sequence. [&\mu=\sum\limit]”
What can the problem be?