%%
%% fuzz.sty for LaTeX2e
%% Version 2.2
%% Copyright (c) J. M. Spivey 1988--94
%%

\ProvidesPackage{fuzz}[1994/02/01]
\RequirePackage[errorshow]{tracefnt} % suppress NFSS info messages

\def\fuzz{{\large\it f\kern0.1em}{\normalsize\sc uzz}}

%
% MATH FONTS AND FAMILIES
%
% The Z symbols font is loaded in every conceivable size.
%

\DeclareFontFamily{U}{oxsz}{}
\DeclareFontShape{U}{oxsz}{m}{n}{%
%   <5> oxsz5
%   <6> oxsz6
%   <7> oxsz7
%   <8> oxsz8
    <9> oxsz9
    <10> <10.95> <12> <14.4> <17.28> <20.74> <24.88> oxsz10
    }{}
\DeclareSymbolFont{zed}{U}{oxsz}{m}{n}

%
% MATHCODES
%
% The mathcodes for the letters A, ..., Z, a, ..., z are changed to
% generate text italic rather than math italic by default. This makes
% multi-character identifiers look better. The mathcode for 'c'
% is set to "7000 (variable family) + "?00 (text italic) + c.
%

% \setmcodes{begin}{end}{base} -- assign successive mathcode to
% characters BEGIN thru END, starting at BASE.
\def\@setmcodes#1#2#3{{\count0=#1 \count1=#3
  \loop \global\mathcode\count0=\count1 \ifnum \count0<#2
  \advance\count0 by1 \advance\count1 by1 \repeat}}

\DeclareSymbolFont{italic}{OT1}{\rmdefault}{m}{it}
\let\mathit\undefined
\DeclareSymbolFontAlphabet{\mathit}{italic}
\edef\@tempa{\hexnumber@\symitalic}
\@setmcodes{`A}{`Z}{"7\@tempa41}
\@setmcodes{`a}{`z}{"7\@tempa61}

%
% COMMON SYMBOLS
%
% Here are some math symbols and conventions that are independent of
% the symbol font.
%

% ~ gives a \, space in math mode
\def~{\ifmmode\,\else\penalty\@M\ \fi}

% Semicolon is active in math mode; it inserts a thick space
\mathcode`\;="8000 % Makes ; active in math mode
{\catcode`\;=\active \gdef;{\mathchar"3B\;}}

% \@myop makes an operator, with a strut to defeat TeX's vertical adjustment.
% (see TeXbook, Appendix G, verse 13, p. 444)
\def\@myop#1{\mathop{\mathstrut{#1}}\nolimits}

% This underscore is a bit wider than the one in Plain, and doesn't
% have the little kern. In math mode, it still suffers from italic
% corrections inserted because a preceding letter is not marked as a
% text symbol (see TeXbook, Appendix G, verse 14, p. 444 and
% verse 17, p. 445). But in such cases, you can write e.g. $"DISK\_POOL"$.
\def\_{\leavevmode \ifmmode\else\kern0.06em\fi \vbox{\hrule width0.5em}}
\mathcode`\"="8000
\def\@kwote#1"{\hbox{\it #1}}
{\catcode`\"=\active \global\let"=\@kwote}

% @ and | are re-defined to produce \spot and \mid.
\mathchardef\spot="320F
\mathcode`\@=\spot
\mathcode`\|=\mid

% \bsup and \esup for superscripts
\def\bsup#1\esup{^{#1}}

% \inrel for underlined relations
\def\inrel#1{\mathrel{\underline{#1}}}

%
% SCHEMAS, Etc.
%
% Here are environments for the various sorts of
% displays which occur in Z documents. All displays are set
% flush left, indented by \zedindent, by default \leftmargini.
% schemas, etc, are made just wide enough to give equal margins
% left and right.
%
% Some environments (schema, etc.) must not be split,
% and others (argue) may be split arbitrarily. All generate alignment
% displays, and penalties are used to control page breaks.
%

% Style parameters
\newdimen\zedindent	\zedindent=\leftmargini
\newdimen\zedleftsep	\zedleftsep=1em
\newdimen\zedtab	\zedtab=2em
\newdimen\zedbar	\zedbar=6em
\newskip\zedskip	\zedskip=0.5\baselineskip plus0.333333\baselineskip
				minus0.333333\baselineskip
\def\zedsize{}

% Internal variables
\newcount\interzedlinepenalty \interzedlinepenalty=10000
\newcount\preboxpenalty \preboxpenalty=0
\newif\ifzt@p		\zt@pfalse

\def\@jot{0.5\zedskip}

\def\@narrow{\advance\linewidth by-\zedindent}

\def\@zrulefill{\leaders\hrule height\arrayrulewidth\hfill}

\def\@topline#1{\hbox to\linewidth{%
  \vrule height\arrayrulewidth width\arrayrulewidth
  \vrule height0pt depth\@jot width0pt
  \hbox to\zedleftsep{\@zrulefill\thinspace}%
  #1\thinspace\@zrulefill}}

\def\@zedline{\omit \vrule height\arrayrulewidth width\linewidth \cr}

\def\where{\@zskip\@jot
  \omit \vrule height\arrayrulewidth width\zedbar \cr
  \@zskip\@jot}

\def\also{\crcr \noalign{\penalty\interdisplaylinepenalty \vskip\zedskip}}
\def\@zskip#1{\crcr \omit \vrule height#1 width\arrayrulewidth \cr}
\def\@zlign{\tabskip\z@skip\everycr{}} % \@lign missing in SliTeX

% This new \t allows braces around numbers 10 and up but doesn't need them
\let\tie=\t
\def\t#1{\afterassignment\@t\count@=#1}
\def\@t{\hskip\count@\zedtab}

% \@setzsize allows size changing in math mode
\def\@setzsize{\let\next=\@nomath\def\@nomath##1{}%
  \skip0=\abovedisplayskip\skip1=\belowdisplayskip
  \zedsize \let\@nomath=\next 
  \abovedisplayskip=\skip0\belowdisplayskip=\skip1}

\def\@zed{\ifvmode\@zleavevmode\fi
  $$\global\zt@ptrue
  \@setzsize
  \advance\linewidth by-\zedindent
  \advance\displayindent by\zedindent
  \def\\{\crcr}% Must have \def and not \let for nested alignments.
  \let\par=\relax
  \tabskip=0pt}

\def\@znoskip{\offinterlineskip
  \everycr={\noalign{\ifzt@p \global\zt@pfalse
    % Simulate interline glue
      \ifdim\prevdepth>-1000pt \skip0=\normalbaselineskip
        \advance\skip0by-\prevdepth \advance\skip0by-\ht\strutbox
        \ifdim\skip0<\normallineskiplimit \vskip\normallineskip
        \else \vskip\skip0 \fi\fi
    \else \penalty\interzedlinepenalty \fi}}}

\def\zed{\@zed\@znoskip\halign to\linewidth\bgroup
  \strut$\@zlign##$\hfil \tabskip=0pt plus1fil\cr}
\def\endzed{\crcr\egroup$$\global\@ignoretrue}

\def\[{\begingroup\zed}
\def\]{\crcr\egroup$$\endgroup\ignorespaces}

\def\axdef{\def\also{\@zskip\zedskip}%
  \predisplaypenalty=\preboxpenalty
  \@zed\@znoskip \halign to\linewidth\bgroup
    \strut \vrule width\arrayrulewidth \hskip\zedleftsep
    $\@zlign##$\hfil \tabskip=0pt plus1fil\cr}
\let\endaxdef=\endzed

\def\schema#1{\@ifnextchar[{\@schema{#1}}{\@nschema{#1}}}
\def\@schema#1[#2]{\@nschema{#1[#2]}}
\def\@nschema#1{\@narrow\axdef \omit\@topline{$\strut#1$}\cr}
\def\endschema{\@zskip\@jot \@zedline \endzed}

\@namedef{schema*}{\@narrow\axdef \@zedline \@zskip\@jot}
\expandafter\let\csname endschema*\endcsname=\endschema

\def\gendef{\@ifnextchar[{\@gendef}{\@ngendef}}
\def\@gendef[#1]{\@narrow\axdef \omit \setbox0=\hbox{$\strut[#1]$}%
  \rlap{\raise\doublerulesep\@topline{\hskip\wd0}}\@topline{\box0}\cr}
\def\@ngendef{\@narrow\axdef \@zedline \omit \hbox to\linewidth{\vrule
  height\doublerulesep width\arrayrulewidth \@zrulefill}\cr \@zskip\@jot}
\let\endgendef=\endschema

\def\argue{\@zed \interzedlinepenalty=\interdisplaylinepenalty
  \openup\@jot \halign to\linewidth\bgroup
    \strut$\@zlign##$\hfil \tabskip=0pt plus1fil
    &\hbox to0pt{\hss[\@zlign##\unskip]}\tabskip=0pt\cr
    \noalign{\vskip-\@jot}}
\let\endargue=\endzed

% \because gives a reason in \argue on a line of its own.
\def\because#1{\noalign{\vskip-\jot}&#1\cr}

\def\syntax{\@zed\@znoskip \halign\bgroup
  \strut$\@zlign##$\hfil &\hfil$\@zlign{}##{}$\hfil
  &$\@zlign##$\hfil\cr}
\let\endsyntax=\endzed

% `infrule' environment: used for inference rules. The horizontal line is
% generated by \derive: an optional argument contains the side-conditions
% of the rule.
\def\infrule{\@zed\@znoskip \halign\bgroup
  \strut\quad$\@zlign##$\quad\hfil&\quad\@zlign##\hfil\cr}
\let\endinfrule=\endzed

\def\derive{\crcr \noalign{\vskip\@jot} \omit\@zrulefill
  \@ifnextchar[{\@xderive}{\@yderive}}
\def\@xderive[#1]{&$\smash{\lower 0.5ex\hbox{$[\;#1\;]$}}$\cr 
  \noalign{\vskip\@jot}}
\def\@yderive{\cr \noalign{\vskip\@jot}}

% \@zleavevmode -- Enter horizontal mode, taking account of possible
% interaction with lists and section heads:
%	1	After a \item, use \indent to get the label (this
%		fails to run in even short labels).
%	2	After a run-in heading, use \indent.
%	3	After an ordinary heading, throw away the \everypar
%		tokens, reset \@nobreak, and use \noindent with \parskip
%		zero. Set \abovedisplayskip to zero.
%	4	Otherwise, use \noindent with \parskip zero
\def\@zleavevmode{\if@inlabel \indent
  \else\if@noskipsec \indent
  \else\if@nobreak \global\@nobreakfalse
      \everypar={}\abovedisplayskip=0pt\fi
    {\parskip=0pt\noindent}\fi\fi}

%
% Z SYMBOLS
%

\let\@mc=\mathchardef
\def\@ms#1"#2?#3#4{\DeclareMathSymbol{#1}{#2}{zed}{"#3#4}}

% In the same order as the Z reference manual ...

% Chapter 2
\@ms \lblot	"4?09
\@ms \rblot	"5?0A
\@ms \bind      "2?01

% Chapter 3
\def \defs	{\mathrel{\widehat=}}
\@ms \@power	"0?0B
\def \power	{\@myop{\@power}}
\let \cross	\times
\def \lambda	{\@myop{\mathchar"115}}
\def \mu	{\@myop{\mathchar"116}}
\@ms \lbag	"4?0E
\@ms \rbag	"5?0F
\def \lnot	{\neg\;}
\@mc \land	"325E
\@mc \lor	"325F
\let \implies	\Rightarrow
\let \iff	\Leftrightarrow
\def \forall	{\@myop{\mathchar"238}}
\def \exists	{\@myop{\mathchar"239}}
\@mc \hide	"326E
\@ms \project	"3?02
\def \pre	{\mathrm{pre}\;}
\@ms \semi	"3?1C
\@ms \ldata	"4?12
\@ms \rdata	"5?13
\let \shows	\vdash
\def \pipe      {\mathrel{\mathchar"13E\!\!\mathchar"13E}}
\def \LET       {{\mathbf{let}}\;}
\def \IF	{{\mathbf{if}}\;}
\def \THEN	{\mathrel{\mathbf{then}}}
\def \ELSE	{\mathrel{\mathbf{else}}}

% Chapter 4
\@ms \emptyset	"0?1E
\@ms \rel	"2?23
\def \dom	{\mathop{\mathrm{dom}}}
\def \ran	{\mathop{\mathrm{ran}}}
\def \id	{\mathop{\mathrm{id}}}
\@ms \comp	"2?1C
\@ms \dres	"2?03
\@ms \rres	"2?04
\@ms \ndres	"2?05
\@ms \nrres	"2?06
\def \inv	{^\sim}
\@ms \limg	"4?10
\@ms \rimg	"5?11
\@ms \pfun	"2?14
\@ms \fun	"2?22
\@ms \pinj	"2?19
\@ms \inj	"2?18
\@ms \psurj	"2?17
\@ms \surj	"2?16
\@ms \bij	"2?1B
\@ms \nat	"0?0D
\@ms \num	"0?1D
\def \div	{\mathbin{\mathsf{div}}}
\def \mod	{\mathbin{\mathsf{mod}}}
\def \upto	{\mathbin{\ldotp\ldotp}}
\def \plus	{^+}
\def \star	{^*}
\@ms \@finset	"0?0C
\def \finset	{\@myop{\@finset}}
\@ms \ffun	"2?15
\@ms \finj	"2?1A
\def \seq	{\mathop{\mathrm{seq}}}
\def \iseq	{\mathop{\mathrm{iseq}}}
\@ms \cat	"2?1F
\@ms \filter	"2?02
\def \dcat	{\mathop{\cat/}}
\def \bag	{\mathop{\mathrm{bag}}}
\def \bcount	{\mathbin{\sharp}}
\@ms \inbag	"3?08
\let \subbageq  \sqsubseteq
\def \disjoint  {{\mathsf{disjoint}}\;}
\def \partition {\mathrel{\mathsf{partition}}}
\def \prefix    {\mathrel{\mathsf{prefix}}}
\def \suffix    {\mathrel{\mathsf{suffix}}}
\def \inseq     {\mathrel{\mathsf{in}}}
\@ms \extract   "2?20
\@ms \uminus    "2?21