On Mon, Oct 26, 2020 at 07:18:01PM +0100, Patrice Dumas wrote: > > Another option is to use htlatex instead (if there is such a program), > > but that could be problematic if there are any important usages of > > plain TeX that don't work with LaTeX. > > I have no idea on that. It is not clear to me to what extent LaTeX is a > superset of TeX or something different. If it is a superset, indeed, > LaTeX tools could always be used, which could be simpler in some cases.
Here's the best information I've found so far. This is a package to use plain TeX in LaTeX: https://ctan.org/pkg/plain-ltx?lang=en > Inside the environment, not everything is as Knuth intended > (some Plain commands are suppressed, some are faked, and some basic > mechanisms—such as font selection and the output routine—remain > as in LATEX). Thus “simple” documents will run, but elaborate > macros defined in the document have a chance of failing. The only macro that I can see that looks relevant for math from looking at the source of that package is \eqalign.
