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+% \iffalse
+%%
+%% File: nccbbb.dtx Copyright (C) 2002--2004 by Alexander I. Rozhenko
+%%
+%<package>\NeedsTeXFormat{LaTeX2e}
+%<package>\ProvidesPackage{nccbbb}
+%<package> [2004/11/24 v1.1 Pure Black Board Bold (NCC)]
+%
+% \changes{v1.0}{2002/01/31}{This version was uploaded to CTAN}
+% \changes{v1.1}{2004/11/24}{Bug in |\bbbz| command fixed}
+% \changes{v1.1}{2004/11/24}{Documentation was prepared}
+%
+%<*driver>
+\let\makeindex\relax
+\documentclass{ltxdoc}
+\usepackage{nccbbb}
+\GetFileInfo{nccbbb.sty}
+\begin{document}
+\title{The \textsf{nccbbb} package\thanks{This file
+ has version number \fileversion, last
+ revised \filedate.}}
+\author{Alexander I. Rozhenko\\rozhenko@oapmg.sscc.ru}
+\date{\filedate}
+\maketitle
+\DocInput{nccbbb.dtx}
+\end{document}
+%</driver>
+% \fi
+% \section{User Interface}
+%
+% \DescribeMacro{\bbb...}
+% The package implements the following poor black board bold math symbols:
+% \begin{center}
+% \begin{tabular}{l@{\qquad}c@{\qquad\vrule\qquad}l@{\qquad}c}
+% Command & Symbol & Command & Symbol\\
+% |\bbbb| & $\bbbb$ & |\bbbm| & $\bbbm$ \\
+% |\bbbc| & $\bbbc$ & |\bbbn| & $\bbbn$ \\
+% |\bbbd| & $\bbbd$ & |\bbbo| & $\bbbo$ \\
+% |\bbbe| & $\bbbe$ & |\bbbp| & $\bbbp$ \\
+% |\bbbf| & $\bbbf$ & |\bbbq| & $\bbbq$ \\
+% |\bbbg| & $\bbbg$ & |\bbbr| & $\bbbr$ \\
+% |\bbbh| & $\bbbh$ & |\bbbs| & $\bbbs$ \\
+% |\bbbi| & $\bbbi$ & |\bbbz| & $\bbbz$ \\
+% |\bbbk| & $\bbbk$ & |\bbbzero| & $\bbbzero$ \\
+% |\bbbl| & $\bbbl$ & |\bbbone| & $\bbbone$ \\
+% \end{tabular}
+% \end{center}
+% It was designed to provide the compatibility with old macros of NCC-\LaTeX.
+% We recommend use the |\mathbb| command from the |amsfonts| package
+% instead.
+% \StopEventually{}
+%
+% \section{The Implementation}
+% Declare commands of the user interface:
+% \begin{macrocode}
+%<*package>
+\newcommand\bbbb{\NCC@bbb{B}}
+\newcommand\bbbc{{\NCC@bbbz{C{\NCC@bbbr{.03}{.35}{.9}{.1}}}}}
+\newcommand\bbbd{\NCC@bbb{D}}
+\newcommand\bbbe{\NCC@bbb{E}}
+\newcommand\bbbf{\NCC@bbb{F}}
+\newcommand\bbbg{{\NCC@bbbz{G{\NCC@bbbr{.05}{.3}{.88}{.09}}}}}
+\newcommand\bbbh{\NCC@bbb{H}}
+\newcommand\bbbi{\NCC@bbb{I}}
+\newcommand\bbbk{\NCC@bbb{K}}
+\newcommand\bbbl{\NCC@bbb{L}}
+\newcommand\bbbm{\NCC@bbbi{M}}
+\newcommand\bbbn{\NCC@bbbi{N}}
+\newcommand\bbbo{{\NCC@bbbz{O{\NCC@bbbr{.05}{.3}{.9}{.09}}}}}
+\newcommand\bbbp{\NCC@bbb{P}}
+\newcommand\bbbq{{\NCC@bbbz{Q{\NCC@bbbr{.05}{.3}{.9}{.09}}}}}
+\newcommand\bbbr{\NCC@bbb{R}}
+\newcommand\bbbs{{\NCC@bbbz{S{\NCC@bbbr{.5}{.3}{.45}{.07}%
+ \NCC@bbbr{0}{.55}{.5}{.07}}}}}
+\newcommand\bbbz{{\NCC@bbbz{{\mathsf Z}{\@tempdima\wd\z@\wd\z@ 0.33\@tempdima}}%
+ \mathsf Z}}
+\newcommand\bbbzero{{\NCC@bbbz{O{\NCC@bbbr{.05}{.3}{.9}{.06}%
+ \NCC@bbbr{.05}{.6}{.9}{.06}}}}}
+\newcommand\bbbone{\mathrm{1\NCC@bbbz{l{\kern -0.88\wd\z@}}}}
+% \end{macrocode}
+%
+% Define base commands:
+% \begin{macrocode}
+\def\NCC@bbb#1{\mathrm{I\mskip -3.5mu#1}}
+\def\NCC@bbbi#1{\mathrm{I\NCC@bbbz{{\mskip -3.5mu I}{\wd\z@\z@}}%
+ \mskip -3mu#1}}
+\def\NCC@bbbz{\mathpalette\NCC@bbbz@}
+\def\NCC@bbbz@#1#2{\NCC@bbbz@@{#1}#2}
+\def\NCC@bbbz@@#1#2#3{\setbox\z@\hbox{$\m@th#1{\mathrm{#2}}$}#3\box\z@}
+\def\NCC@bbbr#1#2#3#4{\raise #1\ht\z@\hbox to \z@{\kern #2\wd\z@
+ \vrule \@height #3\ht\z@ \@width #4\wd\z@\hss}}
+%</package>
+% \end{macrocode}
+\endinput