% EVERYBODY IS FREE TO BORROW THE FILE AND CHANGE IT
% UNDER ONE CONDITION OF NEVER ASKING ME WHY THE THING WORKS
% OR DOES NOT WORK
%
% If I write a book,
%
% I use this file TheGOST.tex when I wish to number thms and such and 
% formulas by one number like 25 put on the left in the case of thms
% and such and to refer to say Thm 25 in the same section as Thm 25, 
% otherwise in the same chapter as Sec.Thm 25, where Sec is the number
% of the section in which Thm 25 appears, and otherwise in the book
% as Ch.Sec.Thm 25, where Ch is the ...The same for formulas.
%
% To use the file some work is to be done.
% Type \swapnumbers righ after \documentclass{amsbook}.
% Type \input{TheGOST} (this-file name) after all definitions in preamble
% where \newcommand{\mysection} should not be present (otherwise
% change below \newcommand{\mysection} by \renewcommand{\mysection}).
% In addition, all \section{ and \chapter{ commands in the tex file
% should be replaced with \mysection{ and \mychapter{ 
% (but not those like \section*{  which
% should be addressed in a different way).
% What about \subsection's? I don't know. Never had one.
%
% To see what an ugly thing I have only using the standard Latex2e,
% in preamble comment out \input{TheGOST} and \swapnumbers,
% type \newcommand{\mysection}{\section}, the same
% with \mychapter, and change \def\thechapter{-1A} (see later)
% with \def\thechapter{A}
%
\makeatletter
%
\renewcommand{\thechapter}{\arabic{chapter}}
\renewcommand{\thesection}{\arabic{section}}
\renewcommand{\theequation}{.\thechapter.\arabic{section}.\arabic{equation}}
\renewcommand{\thetheorem}{.\thechapter.\arabic{section}.\arabic{theorem}}%
%
\newcommand{\mysection}[1]{% 
\section{#1}\setcounter{equation}{0}
 \edef\@currentlabel{.\thechapter.\arabic{section}}}
%
\newcommand{\mychapter}[1]{\chapter{#1}
 \edef\@currentlabel{.\arabic{chapter}}}
%
% To number equations in the printout by one number like 25
% but get in aux file
% the info .Ch.Sec.25 which through \ref (defined below)
% allows to extract different versions of ref numbers 
% on different occasions
\def\mojtag#1{\hbox{\m@th\normalfont#1}}
\def\tagform@#1{\mojtag{(\ignorespaces\arabic{equation}\unskip)}}
%
\def\swappedhead#1#2#3{%
  \arabic{theorem}\thmname{. #1}\thmnote{ {\the\theoremnotefont(#3)}}}
%
% Next found by \meaning\ref  Probably very old.
\def\granddadref#1{\expandafter\@setref\csname
r@#1\endcsname\@firstoftwo{#1}}
%
\renewcommand{\ref}[1]{% good to know that \if...\else whatever\fi
                       % produces . and \if11something\else whatever\fi 
                       % yields this something. Therefore 
                       % the command \if.\dadref{#1} and so on below
                       % chops off . (one point) from \dadref{#1}
                       % if there is anything to chop from. 
$\def\aref{\if.\granddadref{#1}\else-1{\bf??}%
\@warning{Reference `#1' on page \thepage \space HE OnpegeleHA}\fi}%
%
% Next was found after many tries to accomodate all the above
% wihses and also to cope with the case of \chapter*{Appendix}
% to results of  which I wanted to refer to like...Lemma A.1.1..
% "A" is not any \arabic{chapter}. This is why right after
% \chapter*{Appendix} I typed \def\thechapter{-1A}.
%
\def\refa{\ifnum\arabic{chapter}=\aref\else\aref\fi}%
\def\refb{\if.\refa\else\arabic{section}.\aref\fi}%
\def\refc{\ifnum\arabic{section}=\refb\else.\refb\fi}%
\def\refd{\if.\refc\else\refb\fi}
%
% $'s eliminate extra space (of which there is plenty) and \text
% is for right appearance of references in texts of thms.
% It is also perfect for run-in headings in 10pt.
%
\text{\ifnum-1=\refd\else\refd\fi}$}
%
% next commands for numbering in the first chapter 
% like \chapter*{Preface}
%
\setcounter{chapter}{0}\setcounter{section}{0}
\makeatother
%% END of file TheGOST.tex