In the answers to this question: What is the difference between \over and \frac?, one finds the ams and plain latex definitions of \frac, respectively:


Is there a reason grouping is not used around #2? That is, like this:


1 Answer 1


declarations in the numerator of a primitive { ... \over ...} can leak in to the denominator, but an extra group in the denominator would do nothing.

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{ a \over b}
{ \fam0 a \over b}
{\begingroup \fam0 a \endgroup \over b}


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