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Writing math in abstracts and comments

Titles, abstracts, comments, and the “Comments” field of a paper are typeset with KaTeX, which understands most everyday LaTeX math.

Delimiters

Style	Write	Result
Inline	$S = A/4G$ or `$S = A/4G$`	$S = A/4G$
Display	`$$\int_0^\infty e^{-x^2}\,dx = \tfrac{\sqrt\pi}{2}$$`	$$\int_0^\infty e^{-x^2}\,dx = \tfrac{\sqrt\pi}{2}$$
Calligraphic	$\mathcal{N}=4$	$\mathcal{N}=4$

Tips

Dollar signs in prices: write \$5, or put a space after the opening $ (a lone $5 next to $10 is not treated as math).
Math is never evaluated as HTML. < and > are safe; you can also write \lt and \gt.
If something does not render, the raw TeX stays visible instead of disappearing. Check the supported functions at katex.org/docs/supported.html.
The submission form and comment box show a live preview.

Abstract text

Abstracts are plain text with LaTeX math. Leave a blank line between paragraphs. Web addresses are linked automatically; HTML tags are not interpreted.

Style	Write	Result
Inline	$S = A/4G$ or `\(S = A/4G\)`	$S = A/4G$
Display	`$$\int_0^\infty e^{-x^2}\,dx = \tfrac{\sqrt\pi}{2}$$`	$$\int_0^\infty e^{-x^2}\,dx = \tfrac{\sqrt\pi}{2}$$
Calligraphic	$\mathcal{N}=4$	$\mathcal{N}=4$