Re: Texinfo TeX accepts LaTeX math, how?

[Gavin Smith]

On Mon, Oct 26, 2020 at 07:43:10PM +0000, Gavin Smith wrote:
> 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.

Also this package has more documentation:

http://tug.ctan.org/tex-archive/macros/latex/contrib/cjw/

I can't see anything important other than \eqalign.