Which constructs in (La)TeX and (La)TeX packages have classification
The TeXbook mentions:
Which fractions - all? Do other frequently used packages (e.g. AMS-LaTeX) define other constructs (e.g. I'm assuming all types of triple dots in AMS-LaTeX)?
One might expect the following to generate
\mathinner, but they don't:
\bigl...\bigr(and the larger-size analogues)