7:14 AM
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It pains me to break this thread by fixing the issue, but here we are. :) We are now inserting \begingroup and \endgroup directives into post and comment bodies, so all command definitions should be scoped to individual posts. For now, I'm only enabling this on Math (and here on meta), but barr...

> For now, I'm only enabling this on Math (and here on meta), but barring any issues this change will go live on all MathJax-enabled sites next week.
So probably it might be reasonable to check also whether there are some problematic comments/posts on MathOverflow?
This post is a good example where this problem manifests: Is $\delta(df \wedge df)=0$ an Euler-Lagrange equation?
Consider the following functional: $$E_k(f)=\frac{1}{2}\int_{M} \| \bigwedge^k df\|^2 \text{Vol}_{M}.$$ Theorem: The Euler-Lagrange equation of $E_2$, is $A(\phi)=0$, where $A(\phi) \in \Gamma(\phi^*\TN)$ is defined by  A(\phi)=h_{\phi^*TN}\bigg(\tr_{\TM}\big(d\phi \otimes \del...