# Tag Info

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Another option is to use the align environment \begin{align*}...\end{align*}, rather than the array environment. This environment has more flexibility with spacing, which is useful if you don't want your output to look like a table (although this doesn't seem relevant to your example). The align environment gives an essentially identical output to array here:...

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\frac{\left[\begin{array}{cc}A&B\\C&D\end{array}\right]+1}{\left[\begin{array}{cc}E&F\\G&H\end{array}\right]} $$\frac{\left[\begin{array}{cc}A&B\\C&D\end{array}\right]+1}{\left[\begin{array}{cc}E&F\\G&H\end{array}\right]}$$ Anything you can create in MathJax (as far as I know) you can put into a fraction using \frac{Top}{...

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If you want real Fitch-style, you could use: $\def\fitch#1#2{\begin{array}{|l}#1 \\ \hline #2\end{array}}$ $\def\fitch#1#2{\begin{array}{|l}#1 \\ \hline #2\end{array}}$ This can be nested: $\fitch{¬B ∧ (A⇒B)}{ A⇒B \\ ¬B\\ \fitch{A}{ B \\ ¬B \\ ⊥ \\ } \\ ¬A }$ Output is beautiful! $\fitch{¬B ∧ (A⇒B)}{ A⇒B \\ ¬B\\ \fitch{A}{ B \\ ¬... 3 Use \sqrt[n]{m} to get the$n$th root of m:$\sqrt[n]{m}.$3 $$\sqrt[3]{64}$$ produces $$\sqrt[3]{64}$$ This is standard LaTeX syntax, see e.g. this page. It might be confusing since 'sqrt' is an abbreviation of 'square root', but it works nevertheless. 3 As in Xander's answer, / can be used as a delimiter like ()[]|, by which I mean its adjusted by the commands \left, \right, \middle, and also \big, \Big, \bigg, and \Bigg. For instance,$A/B\big/C\Big/D\bigg/E\Bigg/$gives$A/B\big/C\Big/D\bigg/E\Bigg/$. PS the slash slanting the other way can be achieved with$\Bigg\backslash\Bigg\backslash$. Another way ... 2 Take a look here: MathJax basic tutorial and quick reference MathJax is how it's all done. If you already know Latex you're$75\%\$ of the way there.

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