# Mathjax command wont work

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?

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.

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

1 Like

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

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

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

1 Like

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