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%% Macro package `ednmath0.sty' for LaTeX2e, 
%% copyright (C) 2004 Uwe L\"uck, 
%% http://www.contact-ednotes.sty.de.vu 
%% --author-maintained; 
%% math support for `lineno.sty' and `ednotes.sty'. 
%% 
\def\fileversion{v0.2b} \def\filedate{2005/01/10}
%% This program can be redistributed and/or modified under the 
%% terms of the LaTeX Project Public License distributed from 
%% CTAN archives in directory macros/latex/base/lppl.txt; either
%% version 1.3a of the License, or any later version.
%% The latest version of this license is in
%%   http://www.latex-project.org/lppl.txt
%% There is NO WARRANTY. 
%% This code is very EXPERIMENTAL! 
%%
%% Please report bugs, problems, and suggestions via 
%% 
%%   http://www.contact-ednotes.sty@web.de 
% 
%% * MAIN FEATURE * 
% 
% lineno.sty's \linelabel and ednotes.sty's commands are enabled 
% to work in math mode if it's "entered in outer mode" 
% (including `displaymath' and `equation' environments). 
% (lineno.sty is the package by Stephan Boettcher.) 
% They will even work in tabular environments that are adjusted 
% to notes by package `edtable.sty'. 
% 
% CAVEATS: 
% -- Does not work yet in environments like LaTeX's 
% `eqnarray'. (This could probably repaired along the lines 
% of Edtable.sty--we're short of time and will try later.) 
% -- Useful error messages when (i) math mode is entered from 
% inner mode or when (ii) a math display gets not line number 
% are missing at present. 
% 
%% * USAGE: *
% 
% * Most simple: * 
% --If you are working with ednotes and want to use its 
% commands in math mode, load ednotes.sty--version 0.8 
% onwards--with its package option `mathnotes'. 
% --If you don't work with ednotes, only with lineno, you 
% get the main feature of making \linelabel work in math mode 
% by loading lineno.sty--version 4.1 onwards--with its 
% package option `mathrefs'. 
% 
% * Switch off and on: * 
% To reduce danger resulting from missing error messages 
% ("caveat" above), you may switch these new math facilities 
% off by \NoNotesToMath where you don't expect to need them. 
% You may switch them on again by \NotesToMath where you want 
% to use them, being aware of the danger. Both commands work 
% locally, so you can replace one of them by enclosing it in 
% a group. E.g., even, after \NoNotesToMath you can use an 
% environment as follows: 
%   \begin{NotesToMath}
%     <text> 
%   \end{NotesToMath} 
% (I am not quite sure that this is useful.)
% 
% * Customize ellipsis: * 
% ednotes' \lemmaellipsis is changed to expand to 
% \mathlemmaellipsis when entering math, and this is preset 
% to be LaTeX's \mathellipsis. (This is three dots as 
% \mathinner.) You can change this by redefining 
% \mathlemmaellipsis, e.g.: 
%   \renewcommand{\mathlemmaellipsis}{\cdots}
% If you need \cdots as the ellipsis at a single place only, 
% you may, of course, use the `<...>' option of \<, e.g.: 
%   $ x = \Anote{a\<<\cdots>bcd\>e}{Indeed?} - y $
% 
% * Customize note mode: *
% For variant readings, you may want that the note is 
% usually set in math mode--so you may want that you 
% needn't type the dollar signs in the note text. 
% Note that you can do this by customizing \notefmt, 
% and you can do this by customizing \Anotefmt (e.g.) 
% to have this feature for \Anote only. 
% 

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{ednmath0}[\filedate\space\fileversion\space 
  math support for lineno/ednotes (ul)] 
% 
%% User commands: 
\def\NotesToMath{\let\@LN@mathhook\@LN@labelinmath
  \@bsphack \@esphack 
% For \begin{NotesToMath}
} 
\def\NoNotesToMath{\@bsphack
  \def\@LN@mathhook{\@parmoderr\@gobble}% 
  \@esphack 
} 
\def\endNotesToMath{\@bsphack\@Esphack}
\let\endNoNotesToMath\endNotesToMath 
% 
%% Core code for lineno.sty: 
\@ifundefined{@LN@postlabel}{% 
  \PackageError{ednmath0}{% 
    Bad lineno.sty version% 
  }{% 
    lineno.sty from 2004/08/16 or later 
    must be loaded earlier.% 
  }%
}{% 
  \def\@LN@labelinmath#1{% 
    \ifmmode 
      \@LN@postlabel{#1}% 
    \else 
      \@parmoderr 
    \fi 
  }
} 
% 
%% Core code for ednotes.sty: 
\@ifundefined{@EN@note}{% 
% v0.01 sent a warning in this case. Considered superfluous now. 
}{% 
  \def\@EN@themathlemmatag{%
    \ifmmode 
      \toks@\expandafter{\@EN@lemmatag}% 
      \edef\@EN@lemmatag{%
        $% 
          \def\noexpand\lemmaellipsis{% 
            \noexpand\mathlemmaellipsis}% 
          \the\toks@ 
        $% 
      }% 
%       \expandafter \def \expandafter \@EN@lemmatag 
%         \expandafter {\expandafter $\expandafter 
%         \def \expandafter \lemmaellipsis \expandafter {% 
%           \expandafter \mathlemmaellipsis \expandafter }% 
%         \@EN@lemmatag $}% 
    \fi 
  } 
% To be sure, \lemmaellipsis doesn't need to be changed when 
% ednotes `\<...\>' feature is not used. Though I prefer to 
% use one hook only in ednotes for both situations, with and 
% without `\<...\>'. 
% 
% The final \unskip in ednotes' \@EN@lemmatag would undo a final 
% \quad. That's OK: outside math the same happens. 
% In v0.01, \NoNotesToMath undid ednotes changes for math mode. 
% However, re-appearence of \linelabel error messages suffices. 
% 
% Now add lemma switch to the left of \[No]NotesToMath: 
  \toks@\expandafter{\NotesToMath}
  \edef\NotesToMath{% 
    \let \noexpand\@EN@mathlemmatag \noexpand\@EN@themathlemmatag 
    \the\toks@
  }
%  \typeout{\string\NotesToMath: \meaning\NotesToMath}
  \toks@\expandafter{\NoNotesToMath}
  \edef\NoNotesToMath{% 
    \let \noexpand\@EN@mathlemmatag \relax 
    \the\toks@
  }
%  \typeout{\string\NoNotesToMath: \meaning\NoNotesToMath}
} 
% We need no extra device for a choice for users whether the *note* 
% should be set in math mode or in horizontal mode by default 
% (which might depend on the kind ["layer"] of notes). 
% This can be done already by customization of ednotes' \notefmt. 
% However, we might change ednotes' default \notefmt to default 
%   \renewcommand*{\notefmt}[1]{$#1$}
% 
\let\mathlemmaellipsis\mathellipsis 
%% TODO: Since when has LaTeX provided \mathellipsis? 
%% -> \Needs... 
% 
% Default: 
\NotesToMath
% 
\endinput 

%% TODO: Without \linenumberdisplaymath, in displaymath, 
%% an error should be shown. Use, e.g., that in a displaymath 
%% \ifinner is false. 
%% TODO: E.g., by changing \everymath, perhaps can be warned 
%% that the math group is in a box already, so the vertical 
%% items will get lost. 
%% TODO: Adjust `eqnarray' (in Edtable?) as well. 

%% VERSION HISTORY: 
v0.01 2004/08/16  First version, sent to Christian. 
v0.02 2004/08/16  Considerably simplified for ednotes. 
      2004/08/19  Added ellipsis stuff, documentation, and 
                  instructions. Uncapitalized package names. 
                  Added \end[No]NotesToMath. 
      2004/08/20  Added \@bsphack and \@esphack; corrected 
                  ednotes extension (too much deleted, completely 
                  wrong), introducing \@EN@themathlemmatag. 
v0.02b .../08/31  Rearranged preamble concerning maintenance. 
v0.1  2004/09/20  Removed mentions of `linenox0.sty'. 
v0.2  2004/10/07  Removed another mention of `linenox0.sty'; 
                  Instructions: `lineno' or `ednotes.sty' option. 
v0.2a 2004/11/07  LPPL v1.3a. 
v0.2b 2005/01/10  Contact via http.