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By looking at the posts on Mathematics Stack Exchange I have figured out how to produce an inset of math equations, like this:

$S=\{1,2,3\ldots \text{ n for }n\in \mathbb{N}\}\\ Y_{i,j}=\{i|i\in \mathbb{N}\land j|j\in \mathbb{N}\}$

The result that you see, a light grey box to the left of inset equations, is begun by putting a > just before the $ and concluding with an extra return at the end. I have searched the internet the world over and failed to find this feature documented. Can someone please point me to some documentation? If this is a LaTeX feature, I can't find that either.

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    $\begingroup$ It is documented in the help pages. $\endgroup$ – Xander Henderson Mod Feb 10 at 17:39
  • $\begingroup$ Perhaps the title should ask "How" rather than "Why"? $\endgroup$ – hardmath Feb 10 at 18:33
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This isn't part of MathJax or LaTeX; it's part of Markdown, which is the Stack Exchange way of formatting posts in general (e.g. italicizing the name Markdown, or making formatted links).

What you stumbled upon is the blockquote; the linked Help Center article contains almost all other options available to you.

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