# 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}

Homework Helper

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.

Homework Helper
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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Greg Bernhardt and bugatti79