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-% This file is public domain.
-%
-% Test symbolic equation references.
-%
-\ifx\eplain\undefined \input eplain \fi
-
-\loggingall
-\leftdisplays
-
-An equation with a number in its name:
-$$ a+b=1\eqdef{line1}$$
-\line{did we mess up plain's line in equation \eqref{line1}?\hfil}
-
-\bye
-
-The first equation:
-$$x + y = 1 \eqdef{first}$$
-
-In equation \eqref{first}, we said that $x+y=1$.
-Now, in equation \eqref{second}, we say that $a+b=2$.
-
-$$a + b = 2 \eqdef{second}$$
-
-The next equation is unlabeled in the output, but we can still refer to
-it.
-$$c + d = 3 \eqdefn{*}$$
-
-And here's an equation whose text references another equation, namely,
-\eqref{first}:
-$$c=3\eqdef[\eqrefn{first}*]{first-star}$$
-And a reference to it: \eqref{first-star}.
-
-Here is the first of a group of equations: \eqdefn{group}
-$$a = 1\eqsubdef{group-1}$$
-and the invisible second, then the third of the group \eqsubdefn{group-invis}:
-$$b = 2\eqsubdef{group-2}$$
-We refer to the group as \eqref{group}, to the first as
-\eqref{group-1}, the third as \eqref{group-2}, and the invisible second
-as \eqref{group-invis}.
-
-Here's an equation labeled strangely:
-$$a=1\eqdef[\rm strange*]{foo}$$
-And let's refer to \eqref{foo}.
-
-Let's do subequations off that:
-$$b=2\eqsubdef{foo-1}$$
-And refer to it: \eqref{foo-1}.
-
-% We can't use \count255, since #1 might involve contortions which
-% trample it.
-\newcount\subrefcount
-\def\eqsubreftext#1#2{%
- \subrefcount = #2
- \advance\subrefcount by 96
- #1\char\subrefcount
-}
-
-Let's try another group, with a different labelling scheme. Here is the
-first of this group2: \eqdefn{group2}
-$$a = 1\eqsubdef{group2-1}$$
-and the second of the group2 \eqsubdefn{group2-invis}:
-$$b = 2\eqsubdef{group2-2}$$
-We refer to the group2 as \eqref{group2}, to the first as
-\eqref{group2-1}, the third as \eqref{group2-2}, and the invisible second
-as \eqref{group2-invis}.
-
-Here is one done with displaylines:
-% The \hfill's and \llap make the equation numbers come out in the right
-% place if we are not doing \leftdisplays. (See the TeXbook, p.194.)
-%$$\displaylines{
-% \hfill x=1\hfill\llap{\eqdef{displayline-1}}\cr
-% \hfill y=2\hfill\llap{\eqdef{displayline-2}}\cr
-%}$$
-$$\displaylines{
- x=1\eqdef{displayline-1}\cr
- y=2\eqdef{displayline-2}\cr
-}$$
-
-Let's refer to each of the equations in the displaylines:
-\eqref{displayline-1}, \eqref{displayline-2}.
-
-And one with eqalignno:
-$$
-\eqalignno{
- a+b&=c&\eqdef{eqalign-1}\cr
- d+e&=f&\eqdef{eqalign-2}\cr
-}
-$$
-
-And one with leqalignno, and indented more:
-{\leftdisplayindent = 1in
-$$\leqalignno{
- a+b &=c&\eqdef{leqalign-1}\cr
- dt+eg&=f&\eqdef{leqalign-2}\cr
-}$$
-}
-
-And now let's refer to those: \eqref{eqalign-1}, \eqref{eqalign-2},
-\eqref{leqalign-1}, \eqref{leqalign-2}.
-
-
-
-\def\eqprint#1{[\rm A.#1]}
-
-From now on, all equation labels should be in brackets and preceded
-by `A.'. In \eqref{*}, we said that $c+d=3$. And in equation
-\eqref{undefined}, we say that $1+1=2$.
-
-\eqdefn{*x}
-\eqdefn{*y}
-
-We defined equation \eqref{*y}, although we didn't give an equation for
-it.
-This is a forward reference to equation \eqref{forward}.
-
-$$e + f = 4 \eqdef{forward}$$
-
-That equation above defines \eqref{forward}.
-
-
-\newcount\sectionnum \sectionnum = 1
-\def\eqconstruct#1{\the\sectionnum.#1}
-
-And now equation numbers should have a section number (which we start at
-one) preceding them.
-
-$$a+b=1 \eqdef{s-ab}$$
-
-That equation is \eqref{s-ab}. The one we'll define in the next section
-is \eqref{s-cd}.
-
-
-\advance\sectionnum by 1
-The equation in the previous section was \eqref{s-ab}. Let's define one
-in this section:
-
-$$c+d=3 \eqdef{s-cd}$$
-
-And refer to it: \eqref{s-cd}.
-
-\bye