Mathjax command wont work

[Jaouhar]

Hello I’m new to obsidian I was trying to type this command \left\{ in math mode to make curly braces size adjust automatically but it keeps giving me an error anyone knows how to solve this?

[JayKim]

For every ‘left’ bracket you also need to add a ‘right’ bracket, otherwise it gives an error.

For the curly brackets you have to use an extra \ before the bracket, for all other brackets it is not needed.

$$
	\left\{ \sum_{n=1}^{\infty} \left( 1 - \frac{x^2}{n^2 \pi^2} \right) + \left[ \int_a^b x dx \right] \right\}
$$

[Jaouhar]

I wanted to write things like this

It didn’t give me an error when I used only one brace in latex, too bad I can’t write those on obsidian

[JayKim]

Ok that is something different. This is possible with cases:

$$
\begin{cases} 
c(a_i) = a_{i+1} & \text{for }1\le i<l\\ c(a_l) = a_1 
\end{cases}
$$

[JayKim]

And what about this?

$$
% first part
\begin{cases} 
\text{case a} \\ 
\text{case b} \\
\text{case c}
\end{cases}
% arrow
 \quad \stackrel{\text{blabla}}{\Longrightarrow} \quad
% second part
\begin{cases} 
\text{case 1} \\
\text{case 2} \\
\text{case 3} 
\end{cases}
$$

[Jaouhar]

Thank you very much!