LaTeX is not working for this code when I Preview

[bugatti79]

Not sure how to rectify this. Any ideas?

It looks correct via the codecogs website (https://latex.codecogs.com/eqneditor/editor.php)

\begin{align}
(S \circ R)^{-1} & = \left\{ \left< z, x \right> : \left< z, x \right> \in S \circ R \right\} \\
& = \left\{ \left< z, x \right> : \exists y \in Y s.t. \left< y, z \right> \in S, \left< x, y \right> \in R \right\} \\
&= \left\{ \left< z, x \right> : \exists y \in Y s.t. \left< z, y \right> \in S^{-1}, \left< y, x \right> \in R^{-1} \right\} \\
&= S^{-1} \circ R^{-1}
\end{align}

 

[BvU]

Looks correct here too. What are your symptoms ?

$$
\begin{align}
(S \circ R)^{-1} & = \left\{ \left< z, x \right> : \left< z, x \right> \in S \circ R \right\} \\
& = \left\{ \left< z, x \right> : \exists y \in Y s.t. \left< y, z \right> \in S, \left< x, y \right> \in R \right\} \\
&= \left\{ \left< z, x \right> : \exists y \in Y s.t. \left< z, y \right> \in S^{-1}, \left< y, x \right> \in R^{-1} \right\} \\
&= S^{-1} \circ R^{-1}
\end{align}$$

 

[bugatti79]

View attachment 323388

Looks correct here too. What are your symptoms ?

$$
\begin{align}
(S \circ R)^{-1} & = \left\{ \left< z, x \right> : \left< z, x \right> \in S \circ R \right\} \\
& = \left\{ \left< z, x \right> : \exists y \in Y s.t. \left< y, z \right> \in S, \left< x, y \right> \in R \right\} \\
&= \left\{ \left< z, x \right> : \exists y \in Y s.t. \left< z, y \right> \in S^{-1}, \left< y, x \right> \in R^{-1} \right\} \\
&= S^{-1} \circ R^{-1}
\end{align}$$

It does not render when I use the preview button. I have read a few threads on this. Seems to be a common problem unfortunately.

 

[BvU]

There is a known issue with preview: the rendering engine has to be started up first. So if that hasn't been done nothing is processed. A refresh usually does the trick, but be careful to have a spare copy at hand if you did a lot of CTRL-Z to pinpoint the problem.

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[Ibix]

I think you have to refresh while in preview for the page to notice there's LaTeX and fire up the MathJax extension. It doesn't work in the new thread preview, so my advice there is to preview your post as a reply to another thread (there's a delete option in the menu at the bottom left of your post if you post by accident), then paste into your new thread when you're happy.