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In MathJax it seems that \smallsmile and \smallfrown render identically to \smile and \frown respectively (on my computer at least). If other people confirm this issue I'll submit a bug report to the MathJax maintainers.

Consider the code

$$\begin{array}{cc}  
\smallsmile & \smallfrown\\
\smile & \frown
\end{array}$$

Here it is as rendered by the site (this is not a screenshot): $$\begin{array}{cc} \smallsmile & \smallfrown\\ \smile & \frown \end{array}$$ Here it is as I see it in Chrome 26.0.1410.64 m (zoomed in 250%):

                                                                 enter image description here

Here it is as I see it in Internet Explorer 10.0.9200.16540 (zoomed in 250%):

                                                                 enter image description here

Here it is as I see it when compiling it in my LaTeX editor (zoomed in 250%):

                                                                 enter image description here

I'm using Windows 7 Home Premium 64-bit.

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    $\begingroup$ If I may not-so-humbly suggest, can this question (or its general structure) be listed somewhere official as the desired format for all reports of "this formatting looks weird"? $\endgroup$ – Zev Chonoles Apr 12 '13 at 22:35
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    $\begingroup$ Did the fact that the \smallfrown and the \frown look the same made you \frown or just a \smallfrown? Or maybe it actually made you \smile? :-) $\endgroup$ – Asaf Karagila Apr 12 '13 at 23:13
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This is a bug in MathJax's font data table. The small frown should be a "variant form" that is taken from a different font from the larger form. Currently however, they both produce the same character in the same font. This will be fixed in the next release of MathJax. Thanks for reporting the problem. I've opened an issue for this on the MathJax GitHub site.

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  • $\begingroup$ Thanks for your help, Davide! $\endgroup$ – Zev Chonoles Apr 13 '13 at 23:14
  • $\begingroup$ Note: this has been fixed in v2.2-beta of MathJax. Since MSE uses that version, you should see the correct rendering in Zev's first example above. $\endgroup$ – Davide Cervone May 12 '13 at 22:47

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