% \iffalse meta-comment
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% Copyright 1989-2005 Johannes L. Braams and any individual authors
% listed elsewhere in this file.  All rights reserved.
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% This file is part of the Babel system.
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% and covered by LPPL is defined by the unpacking scripts (with
% extension .ins) which are part of the distribution.
% \fi
%% \CheckSum{126}
%
%\iffalse
%
%% This is file `grmath.sty'
%% (c) 1997-2005 Apostolos Syropoulos.
%% All rights reserved.
%  You are allowed to modify this file as long the initial copyright notice
%  appears in the modified file.
%
%  Please report errors or suggestions for improvement to
%    
%    Apostolos Syropoulos
%    366, 28th October Str.
%    GR-671 00 Xanthi, GREECE
%    
%    apostolo at platon.ee.duth.gr or apostolo at obelix.ee.duth.gr
%
%\fi
%\iffalse
%    \begin{macrocode}
%<*driver>
\documentclass{ltxdoc}
\GetFileInfo{grmath.drv}
\begin{document}
   \DocInput{grmath.dtx}
\end{document}
%</driver>
%    \end{macrocode}
%\fi
%
% \changes{grmath-1.2}{2001/02/12}{Package provides options ``grlog'' 
%          (default) and ``enlog'' that create Greek and Latin names
%          log functions} 
%
% \title{Greek log-like Operators}
% \author{Apostolos Syropoulos\\
%         366, 28th October Str.\\
%         GR-671 00 Xanthi, HELLAS\\
%         E-mail: \texttt{apostolo@platon.ee.duth.gr}}
% \date{2001/02/12}
% \maketitle
%
% \MakeShortVerb{|}
% \section{What is this all about?}
% 
% In Greece, until recently, it was common practice to write down most
% log-like functions as abbreviations of their Greek names. Consequently, 
% high school students and even university freshmen were not familiar with 
% the Latin names employed in international literature. However, this practice
% is fading away in universities but it is still in wide use in books for
% high schools, mainly because the Latin names would produce nothing but
% confusion. The package |grmath| redefines most log-like definitions
% so that they produce the Greek name, instead of the Latin one. The package
% can be used only in conjunction with the |greek| option of the |babel|
% package. The new option |enlog| allows one to keep the Latin names for
% the log functions. 
% \StopEventually
%
% \section{The Implementation}
%
% As usual we must first identify ourselves.
%
%    \begin{macrocode}
%<*package>
\ProvidesPackage{grmath}[2001/02/12\space v1.2]
\typeout{Package: `grmath' v1.2\space <2001/02/12> (A. Syropoulos)}
%    \end{macrocode}
%
% The next thing we do is to process the options. The default option
% ``grlog'' generates Greek names for log functions and the ``enlog''
% option generates Latin names for log functions.
%    \begin{macrocode} 
\DeclareOption{grlog}{%
  \def\log{\mathop{\mathgroup\symgroperators log_{10}}\nolimits}
  \def\ln{\mathop{\mathgroup\symgroperators log_%
         {\mathgroup\symoperators e}}\nolimits}
}
\DeclareOption{enlog}{%
  \def\log{\mathop{\operator@font log}\nolimits}
  \def\ln{\mathop{\operator@font ln}\nolimits}
}
\ExecuteOptions{grlog}
\ProcessOptions
%    \end{macrocode}
% 
% Now we check to see if the |babel| package is loaded with at least
% the |greek| option. In case it isn't, we opt to produce an error message.
%    \begin{macrocode} 
\@ifpackagewith{babel}{greek}{}{%
     \@ifpackagewith{babel}{polutonikogreek}{}{%
     \PackageError{grmath}{%
     `greek' option of the `babel'\MessageBreak
      package hasn't been loaded}{%
      The commands provided by this package\MessageBreak
      are specially designed for greek language\MessageBreak
      typesetting with the `babel' package. Load\MessageBreak
      it with at least the `greek' option.}\relax
      }}
%    \end{macrocode}
%
% We define the mathematical font which will be used to typeset
% the log-like functions.
%    \begin{macrocode}
\DeclareSymbolFont{groperators}{LGR}{cmr}{m}{n}
\SetSymbolFont{groperators}{bold}{LGR}{cmr}{bx}{n}
%    \end{macrocode}
%
% We are now ready to proceed with the redefinitions of the log-like
% operator names. 
%    \begin{macrocode}
\def\sin{\mathop{\mathgroup\symgroperators hm}\nolimits}
\def\cos{\mathop{\mathgroup\symgroperators sun}\nolimits}
\def\tan{\mathop{\mathgroup\symgroperators ef}\nolimits}
\def\arcsin{\mathop{\mathgroup\symgroperators toxhm}\nolimits}
\def\arccos{\mathop{\mathgroup\symgroperators toxsun}\nolimits}
\def\arctan{\mathop{\mathgroup\symgroperators toxef}\nolimits}
\def\cot{\mathop{\mathgroup\symgroperators sf}\nolimits}
\def\sec{\mathop{\mathgroup\symgroperators tem}\nolimits}
\def\csc{\mathop{\mathgroup\symgroperators stem}\nolimits}
\def\gcd{\mathop{\mathgroup\symgroperators MKD}\nolimits}
%    \end{macrocode}
% In the standard \LaTeX\ distribution there is no provision for a
% Least Common Multiple (lcm) log-like operator. Since, this operator
% appears quite often in greek literature we opt to include it. Moreover,
% we include three more log-like functions: |\arccot|, |\arcsec| and
% |\arccsc|.
%    \begin{macrocode}
\def\lcm{\mathop{\mathgroup\symgroperators EKP}\nolimits}
\def\arccot{\mathop{\mathgroup\symgroperators toxsf}\nolimits}
\def\arcsec{\mathop{\mathgroup\symgroperators toxtem}\nolimits}
\def\arccsc{\mathop{\mathgroup\symgroperators toxstem}\nolimits}
%</package>
%    \end{macrocode}
%
% \section*{Dedication}
% I would like to dedicate this piece of work to my son 
% \begin{center}Demetrios-Georgios.\end{center}
% \Finale
\endinput
