About KaTeX 's Error

[Orange-Jun]

Some errors when writing mathematical formulas using KaTeX

For example:

1. $\S$
2. $$ y = x^2 \; \mbox{(二次函数)} $$

3. 
   \left\\{
   \begin{aligned}
   2x + y &= 1 \\\\
   2x + 2y &= 2
   \end{aligned}
   \right.
   \end{equation} 

4. ......

These errors are just a few

Error message

KaTeX parse error: Undefined control sequence: \S at position 1: \̲S̲ KaTeX parse error: Undefined control sequence: \mbox at position 12: y = x^2 \; \̲m̲b̲o̲x̲{(二次函数)} KaTeX parse error: No such environment: equation at position 7: \begin{̲e̲q̲u̲a̲t̲i̲o̲n̲}̲ \left\{ \begi…

Environment

• Boostnote version: 0.15.3
• OS version and name: Windows 10

Thanks

Can you help me understand the cause of this problem？ If you can solve it, thank you very much！ 谢谢！

[Flexo013]

Thanks for creating this issue! Here are solutions to your problems:

1. KaTeX does not support \S in math mode, so you need to escape it like this: \text{\S}
2. You are in a math environment so use y = x^2 \text{;(二次函数)}
3. There is a typo in your snippet, so an error is expected. Remove one backslash after \left, and also don't end the equation environment yourself, the $$ already does that for you:

   \left\{
   \begin{aligned}
   2x + y &= 1 \\\\
   2x + 2y &= 2
   \end{aligned}
   \right.