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+% =====================================================================
+% == Greek Fonts & Format ==
+% == An example of the use of KD fonts & macros ==
+% == in composing papers containing greek text ==
+% == ==
+% == (C) Copyright 1991 K J Dryllerakis ==
+% == ==
+% == Last Revision : Sep 23, 1991 ==
+% =====================================================================
+%
+\input greektex % This is superfluous if greek format is used
+% ^ Use Version 3.0[b] or higher
+%
+% =====================================================================
+% == Font Declarations ==
+% =====================================================================
+%
+\catcode`@=11 % Access Plain TeX and its Macros
+%
+% The following point-setting macros are based on D Knuth's TeXBook
+%
+% Load standard fonts and their specifications
+%
+\font\ninerm=cmr9 \font\eightrm=cmr8 \font\sixrm=cmr6
+\font\ninei=cmmi9 \font\eighti=cmmi8 \font\sixi=cmmi6
+\font\ninesy=cmsy9 \font\eightsy=cmsy8 \font\sixsy=cmsy6
+\font\ninebf=cmbx9 \font\eightbf=cmbx8 \font\sixbf=cmbx6
+\font\ninett=cmtt9 \font\eighttt=cmtt8
+\font\nineit=cmti9 \font\eightit=cmti8
+\font\ninesl=cmsl9 \font\eightsl=cmsl8
+\skewchar\ninei='177 \skewchar\eighti='177 \skewchar\sixi='177
+\skewchar\ninesy='60 \skewchar\eightsy='60 \skewchar\sixsy='60
+\hyphenchar\ninett=-1 \hyphenchar\eighttt=-1 \hyphenchar\tentt=-1
+\font\csc=cmcsc10
+\font\titlefont=cmbx10 scaled\magstep1
+%
+% Define Font Point Families
+%
+\newskip\ttglue % for listings
+\def\tenpoint{\def\rm{\fam0\tenrm}%
+ \gdef\t@size{\grtenpoint} % We want greek to follow our conventions
+ \textfont0=\tenrm \scriptfont0=\sevenrm \scriptscriptfont0=\fiverm
+ \textfont1=\teni \scriptfont1=\seveni \scriptscriptfont1=\fivei
+ \textfont2=\tensy \scriptfont2=\sevensy \scriptscriptfont2=\fivesy
+ \textfont3=\tenex \scriptfont3=\tenex \scriptscriptfont3=\tenex
+ \textfont\itfam=\tenit \def\it{\fam\itfam\tenit}
+ \textfont\slfam=\tensl \def\sl{\fam\slfam\tensl}
+ \textfont\ttfam=\tentt \def\tt{\fam\ttfam\tentt}
+ \textfont\bffam=\tenbf \def\bf{\fam\bffam\tenbf}
+ \scriptfont\bffam=\sevenbf \scriptscriptfont\bffam=\fivebf
+ \tt \ttglue=.5em plus .25em minus.15em
+ \normalbaselineskip=.6cm
+ \setbox\strutbox=\hbox{\vrule height8.5pt width0pt depth4.5pt}%
+ \let\sc=\eightrm \normalbaselines\rm}
+%
+\def\ninepoint{\def\rm{\fam0\ninerm}%
+ \gdef\t@size{\grninepoint} % We want greek to follow our conventions
+ \textfont0=\ninerm \scriptfont0=\sixrm \scriptscriptfont0=\fiverm
+ \textfont1=\ninei \scriptfont1=\sixi \scriptscriptfont1=\fivei
+ \textfont2=\ninesy \scriptfont2=\sixsy \scriptscriptfont2=\fivesy
+ \textfont3=\tenex \scriptfont3=\tenex \scriptscriptfont3=\tenex
+ \textfont\itfam=\nineit \def\it{\fam\itfam\nineit}
+ \textfont\slfam=\ninesl \def\sl{\fam\slfam\ninesl}
+ \textfont\ttfam=\ninett \def\tt{\fam\ttfam\ninett}
+ \textfont\bffam=\ninebf \def\bf{\fam\bffam\ninebf}
+ \scriptfont\bffam=\sixbf \scriptscriptfont\bffam=\fivebf
+ \tt \ttglue=.5em plus .25em minus.15em
+ \normalbaselineskip=.52cm
+ \setbox\strutbox=\hbox{\vrule height8pt width0pt depth3pt}%
+ \let\sc=\sevenrm \normalbaselines\rm}
+%
+\def\eightpoint{\def\rm{\fam0\eightrm}%
+ \gdef\t@size{\greightpoint} % We want greek to follow our conventions
+ \textfont0=\eightrm \scriptfont0=\sixrm \scriptscriptfont0=\fiverm
+ \textfont1=\eighti \scriptfont1=\sixi \scriptscriptfont1=\fivei
+ \textfont2=\eightsy \scriptfont2=\sixsy \scriptscriptfont2=\fivesy
+ \textfont3=\tenex \scriptfont3=\tenex \scriptscriptfont3=\tenex
+ \textfont\itfam=\eightit \def\it{\fam\itfam\eightit}
+ \textfont\slfam=\eightsl \def\sl{\fam\slfam\eightsl}
+ \textfont\ttfam=\eighttt \def\tt{\fam\ttfam\eighttt}
+ \textfont\bffam=\eightbf \def\bf{\fam\bffam\eightbf}
+ \scriptfont\bffam=\sixbf \scriptscriptfont\bffam=\fivebf
+ \tt \ttglue=.5em plus .25em minus.15em
+ \normalbaselineskip=.35cm
+ \setbox\strutbox=\hbox{\vrule height7pt width0pt depth2pt}%
+ \let\sc=\sixrm \normalbaselines\rm}
+%
+% =====================================================================
+% == Format (Page) Definitions ==
+% == New Output routine ==
+% =====================================================================
+\newdimen\pagewidth \newdimen\pageheight \newdimen\ruleht
+\hsize=16.5truecm \vsize=23truecm \maxdepth=2.5pt
+\parindent=10pt \parskip=0pt
+\pagewidth=\hsize \pageheight=\vsize \ruleht=1pt
+\abovedisplayskip=6pt plus 3pt minus 1pt
+\belowdisplayskip=6pt plus 3pt minus 1pt
+\abovedisplayshortskip=0pt plus 3pt
+\belowdisplayshortskip=4pt plus 3pt
+\hfuzz=1pt % Do not make fuss for over 1pt of overfull hbox!
+\overfullrule=0pt % and certainly don't show these boxes to us!
+%
+% Define New Insert for Footnotes
+%
+%
+\def\footnote#1{\edef\@sf{\spacefactor\the\spacefactor}#1\@sf
+ \insert\footins\bgroup\eightpoint
+ \interlinepenalty100 \let\par=\endgraf
+ \leftskip=0pt \rightskip=0pt
+ \splittopskip=10pt plus 1pt minus 1pt \floatingpenalty=20000
+ \smallskip\textindent{#1}\bgroup\strut\aftergroup\@foot\let\next}
+\skip\footins=12pt plus 2pt minus 4pt % space added when footnote exists
+\dimen\footins=30pc % maximum footnotes per page
+\def\footnt{\advance\footno by1\footnote{$^{\number\footno}$}}
+%
+%
+\newif\ifnopagenums\nopagenumsfalse % Shall we include pagenumbers
+\def\nopagenumbers{\nopagenumstrue}
+\def\pagenumbers{\global\nopagenumsfalse}
+%
+% Headlines
+%
+\def\rhead{} % Running Head
+\def\leftheadline{\hbox to\pagewidth{%
+ \vbox to 10pt{}% Strut to position the baseline
+ \tenit\rhead\hfil%
+ \ifnopagenums\else\rlap{\kern0.1pc\tenbf\folio}\fi}}% Running Head left
+\def\rightheadline{\hbox to\pagewidth{%
+ \vbox to 10pt{}% Strut to position the baseline
+ \tenit\rhead\hfil%
+ \ifnopagenums\else\rlap{\kern0.1pc\tenbf\folio}\fi}}%Running Head right
+%
+% Output routine
+%
+\def\onepageout#1{\shipout\vbox{
+ \offinterlineskip
+ \vbox to 3pc{
+ \ifnum\pageno>1
+ \ifodd\pageno\rightheadline\else\leftheadline\fi
+ \fi
+ \vfill}
+ \vbox to \pageheight{
+ #1
+ \ifvoid\footins\else
+ \vskip\skip\footins \kern-3pt
+ \hrule height\ruleht width3cm \kern-\ruleht \kern3pt
+ \unvbox\footins
+ \fi
+ \boxmaxdepth=\maxdepth}}
+ \advancepageno}
+\output{\onepageout{\unvbox255}}
+\newcount\footno\footno=0 % Footnote Number
+\def\section#1{%
+ \medbreak\bigskip
+ \centerline{{\bf #1}}\nobreak
+ \bigskip}
+%
+\def\titleline#1{\line{\hss\titlefont #1\hss}}
+\def\beginFine{\par\bgroup\eightpoint}
+\def\endFine{\egroup\par}
+%
+% Verbatim Listings
+%
+\def\uncatcodespecials{\def\do##1{\catcode`##1=12}\dospecials}
+\def\ttverbatim{\begingroup
+\uncatcodespecials\obeyspaces\obeylines\tt}
+{\obeyspaces\gdef {\ }}
+\outer\def\begintt{\let\par=\endgrapf \ttverbatim\parskip=0pt
+ \ttfinish}
+
+{\catcode`\|=0 |catcode`|\=12
+|obeylines
+|gdef|ttfinish#1^^M#2\endtt{#1|vbox{#2}|endgroup}}
+\catcode`\|=\active % When not in a greek group
+{\obeylines\gdef|{\ttverbatim\spaceskip=\ttglue\let^^M=\ \let|=\endgroup}}
+% =====================================================================
+% == Miscellaneous Definitions ==
+% =====================================================================
+\def\today{\ifcase\month\or
+January\or February\or March\or April\or May\or June\or July\or
+August \or September\or October\or November\or December\fi
+\space\number\day, \number\year}
+
+\def\boxit#1{\vbox{\hrule\hbox{\vrule\kern3pt\vbox{\kern3pt#1\kern3pt}%
+\kern3pt\vrule}\hrule}}
+\def\topboxit#1{\vtop{\hrule\hbox{\vrule\kern3pt\vbox{\kern3pt#1\kern3pt}%
+\kern3pt\vrule}\hrule}}
+\catcode`@=12
+% New defs
+\def\LaTeX{{\rm L\kern-.36em\raise.3ex\hbox{\csc a}\kern-.15em
+ T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
+\def\greektex{{\csc GreeK}\TeX}%
+\chardef\|`\|
+%
+\newdimen\lefthsize
+\newdimen\exdepth
+\newcount\testcount
+\newbox\exbox
+%
+% Macro For typesetting examples
+%
+\def\exparagraph{%
+\hangindent\lefthsize\testcount=0%
+\loop \advance\testcount by1\ifdim\exdepth>\testcount\baselineskip \repeat
+\advance\testcount by-1
+\hangafter-\testcount
+\rlap{\hbox to\hangindent{\hss\vbox to0pt{\box\exbox\vss}\hss}}
+\ignorespaces}
+
+\def\contparagraph#1{%
+\hangindent\lefthsize
+\hangafter-#1\ignorespaces}
+%
+% =====================================================================
+%
+\greekdelims{dollar} % keep bar for ttverbatim
+\vskip2truecm
+\titleline{Typesetting Greek Texts with \greektex}
+\bigskip
+\centerline{\csc K J Dryllerakis}
+\bigskip
+\centerline{Imperial College}
+\centerline{Department of Computing}
+\centerline{London}
+\centerline{(|kd@doc.ic.ac.uk|)}
+\vskip1truecm
+
+ This document describes \greektex, yet another something-\TeX\
+application, a package for typesetting greek texts. The following
+pages are intended to be a quick tutorial on the package and not a
+detailed account of the package. It is assumed that the \greektex\
+package is already installed at you site and both the greek format
+file (|greek.fmt|) and the alternative \greektex\ macros
+(|greektex.tex|) are accesible to the user. We also assume that all
+the recomended |kd| fonts exist in the font path. If this is not the
+case please consult the installation procedure document which gives
+all the information needed to install the package in your site. In
+the discussion to follow, more \TeX nical material is presented in a
+finer print.
+
+\section{The Greek Mode And Fonts}
+
+ In order to typeset greek text, you have to advise \TeX\ to
+enter a ``Greek Mode''\footnt{The idea of a ``greek environment'' was first
+introduced by Sylvio Levi in his greek fonts; the top level macros of
+our package are inherited from this first approach.}. Entering the
+greek mode is achieved by typing |\begingreek| at the position were
+we want the greek text to begin. The greek mode will be active until
+an |\endgreek| is typed, when we return to the previous state. Inside
+the greek mode, the latin characters typed correspond to the greek
+alphabet and diacritic marcs. The family changing commands (|\sl|,
+|\bf|, |\tt|, |\it|) are automatically switched to correspond to the
+proper greek font families and the classical greek font corresponds
+to the |\gr| or |\rg| command. Roman letters are still available
+through the |\rm| and |\l|{\it oldsequence\/} commands (e.g. |\lsl|).
+When we re-enter the greek mode, the font used last is remembered and
+typesetting continues from the state we left of in the previous greek
+mode.
+\beginFine
+ \TeX nically, entering the greek mode means {\it i\/}. to redifine the
+|\catcode| values for several characters (mostly accents and
+breathing symbols), {\it ii\/}. to declare that we are currently
+typesetting in greek and use the correct hyphenation tables, {\it
+iii\/}. switch to the point size and font used last, and {\it iv\/}.
+redifine the control sequences corresponding to font family switching
+(e.g. |\sl| etc.).
+\endFine
+The font families that are currently avaible are all based on the
+original designs by Sylvio Levi and Haralambous. The families (and
+the corresponding font switching commands) are: classical greek
+(|\gr| or |\rg|), slanted greek (|\sl|), greek italics (|\it|),
+boldface greek (|\bf|) and typewriter greek (|\tt|). Remember that
+these families are only available inside greek mode.
+\beginFine
+ A set of point-setting commands are made available from the
+greek format. Three sizes are prespesified for ten, nine, and eight
+points respectevly. The corresponding commands are |\grtenpoint|,
+|\grninepoint|, and |\greightpoint|. Since not all fonts exist in the
+sizes need, scaled fonts are used instead. Remeber that re-entry in
+the greek mode means picking up from exactly where we previously left
+i.e. from the same point size. If point-size changes are to remain
+local the user is encouraged to enclose them in groups.
+
+ The real names for the control sequences switching to greek
+font families are |\gr|, |\git|, |\gsl|, |\gbf|, |gtt|. These
+commands can be used even outside greek mode to typeset greek short
+texts but it is not recomended. Note that the \LaTeX\ version of
+\greektex\ (the greek style file |greek.sty|) uses only these font
+changing commands.
+\endFine
+Since the commands |\begingreek| and |\endgreek| can be quite tedious
+to repeat, they can be both substituted either by the character |$| or
+{\tt\|} if at the beginning of your file you specify
+|\greekdelims{dollar}| or |\greekdelims{bar}| repsectively. In case
+the |$| character is used, math mode is accessed by the control
+sequence |\math|.
+
+\section{The Greek Alphabet}
+
+ Since \TeX\ was designed to help portability of files, most
+implemetations support only 128 character input (file transfer is
+also based on the 128 ascii set). That means we have to use the Latin
+alphanumeric characters to represent the greek ones. The following
+scheme is used to represent greek characters inside the greek mode:
+\math\math
+\hbox{\valign{
+ \hbox to 10pt{\hfil\strut$#$\hfil}&\hbox to 10pt{\hfil\strut\tt#\hfil}\cr
+ a&a\cr b&b\cr g&g\cr d&d\cr e&e\cr z&z\cr h&h\cr j&j\cr
+ i&i\cr k&k\cr l&l\cr m&m\cr n&n\cr x&x\cr o&o\cr p&p\cr
+ r&r\cr c&s\cr t&t\cr u&u\cr f&f\cr q&q\cr y&y\cr w&w\cr
+ c&c\cr}}
+\math\math
+\beginFine
+ It is a common practise in Greece to substitue the characters
+corresponding to the higher
+ascii codes by greek characters so that users are able to see the
+greek characters directly on the screen. It is fairly easy to write a
+program to transform any such ascii output to the corresponding
+``latin'' representation of the greek characters and feed it directly
+to \TeX 's mouth. For example such a translation program is supplied
+with the current distribution of the em\TeX\ package for DOS based
+machines.
+\endFine
+
+\section{Accents, Breathing And Punctuation}
+
+ Three different accents are encountered in greek texts. In
+order to accent a vowel simply type |'|, |`|, or |~| to get an acute,
+grave or circumflex accent repsectively. Breathing signs are achieved
+in the same way by preceding the vowel (and any accent that it may
+have) with |<| for rough and |>| for
+smooth breathing. Breathings can also be used before a greek rho
+($r$). Iota subscript is achieved by typing {\tt \|} {\it after\/}
+vowel. The diairesis sign is achieved by presiding a (maybe accented)
+vowel by |"|. Greek punctutation marcs are achieved according to the
+following table:
+\math\math
+\hbox{\valign
+ {\hbox to 15pt{\hfil\strut$#$\hfil}&\hbox to 15pt{\hfil\strut\tt#\hfil}\cr
+ .&.\cr ,&,\cr ;&;\cr :&:\cr !&!\cr ?&?\cr ''&''\cr ((&((\cr ))&))\cr}}
+\math\math
+For example, concider the following quotation from Xenophon :
+\bigskip
+{\narrower\narrower\noindent$>En o>udem'ia g'ar p'olei t`o b`eltiston e>'unoun >est`i t~w|
+d~hmw|, >all`a t`o k'akiston >en <ek'asth| >est`i p'olei e>'unoun
+t~w| d~hmw|; o<i g'ar <'omoioi to~ic <omo'ioic e>'unoi e>isi.$\par}
+\bigskip
+\noindent was typeset by \par
+\medskip
+\math\math
+\vbox{\advance\hsize by-40pt\parindent=0pt\noindent
+\obeylines
+|>En o>udem'ia g'ar p'olei t`o b`eltiston e>'unoun >est`i t~w|{\tt\|}
+|d~hmw|{\tt\|}|, >all`a t`o k'akiston >en <ek'asth|{\tt\|}| >est`i|
+|p'olei e>'unoun t~w|{\tt\|}| d~hmw|{\tt\|}|; o<i g'ar <'omoioi to~ic|
+|<omo'ioic e>'unoi e>isi.|
+}
+\math\math
+\noindent Note the use of punctuation and breathing marks before the
+vowels.
+\beginFine
+All accents and breathings are recognised as normal letters insode
+the greek mode. They will print for themselves when they stand alone
+but form ligatures when preciding a vowel. The ligatures do all the
+work for us; the kerning between accents or breathing and capital
+vowels is also done through kerning. This simplifies the macros used
+and the greek character set is usable with only a few |\catcode|
+definitions. All the rest of the mechanisms supplied in the greek
+format are only to facilitate the usage of the fonts in standard text
+and macro creation.
+\endFine
+
+\section{Hyphenation}
+
+ If you are working with the greek format file, then correct
+hyphenation is assured for greek text. The hyphenation patterns
+supplied in the file are the ones compiled by Haralambous in France.
+If you are working with the file |greektex.tex| then no hyphenation
+patterns are loaded; this fact makes the macros of |greektex.tex|
+suitable for only small greek texts. \greektex, takes full advantage
+of the multilingual characteristics of \TeX\ version 3.0 or higher by
+declaring a new language and identifying the correct patterns for this
+new language. The result is correct hyphenation for texts containing
+both greek and latin texts.
+\beginFine
+In case you want to use \greektex with another multilingual package,
+it is important to find out the limitation of your \TeX version. It
+is possible that the number of allowed hyphenation patterns exceeds
+the number needed. Remember that plain \TeX\ uses 4447 patterns and
+\greektex\ needs a futher 1170.
+
+It is possible to see the proposed hyphenation for a word using a
+macro similar to |\showhyphens| (supplied with plain \TeX). The macro
+|\showgreekhyphens| can be used succesfully only inside greek mode.
+This is due to the fact that the argument for the macro has to be
+scanned with the correct |\catcode| values active.
+\endFine
+\bigskip
+%
+%%%% TEST
+
+\section{Building Macros}
+
+ Let us now turn to some examples that will demonstrate the
+use of the \greektex\ macros within your own definitions.
+
+%% Define macros for the current section
+
+\def\verse#1#2{\line{#1\hfil#2}}
+
+
+\setbox\exbox=\vtop{\hrule height0pt
+\hrule\hbox{\vrule\kern6pt\vbox{\kern6pt%
+ \vbox{\hsize=7truecm
+ $\greightpoint
+ \centerline{\bf PALAIOJEN ELLHNIS}
+ \smallskip
+ \verse{Kauqi'etai <h >Anti'oqeia}{gi`a t`a lampr'a thc kt'iria,}
+ \verse{ka`i to'uc <wra'iouc thc dr'omouc;}{gi`a t`hn per`i a>ut'hn}
+ \verse{jaum'asian >exoq'hn,}{ka`i gi`a t`o m'ega pl~hjoc}
+ \verse{t~wn >en a>ut~h| kato'ikwn.}{Kauqi'etai po`u e>~in'' <h <'edra}
+ \verse{>end'oxwn basil'ewn;}{ka`i gi`a to`uc kallit'eqnac}
+ \verse{ka`i to`uc sofo'uc po`u >'eqei,}{ka`i gi`a to`uc bajuplo'utouc}
+ \verse{ka`i gnwstiko`uc >emp'orouc.}{M`a pi`o pol`u >asugkr'itwc}
+ \verse{>ap'' <'ola, <h >Anti'oqeia}{kauqi'etai po`u e>~inai p'olic}
+ \verse{palai'ojen <ellhn'ic;}{to~u >'Argouc suggen'hc:}
+ \verse{>ap'' t`hn >I'wnh po`u}{<idr'ujh <up`o >Arge'iwn}
+ \verse{>apo'ikwn pr`oc tim`hn}{t~hc k'orhc to~u >In'aqou.}
+ \bigskip
+ \leftline{K. Kab'afhc}$
+ }
+ \kern6pt}\kern6pt\vrule}\hrule}
+\lefthsize=\wd\exbox\advance\lefthsize by20pt%
+\exdepth=\dp\exbox\advance\exdepth by\ht\exbox
+%% End of example macros
+
+\exparagraph Let us try to typeset this poem written by a greek poet
+of the 20th century. The peculiar format is the original one required
+by the poet. It is immediatly apparent that a command taking two
+arguments can be used to typeset each verse; the arguments will be
+the left and right part of each verse. The only important problem
+encountered is the following: when \TeX\ is reading the
+arguments of a command, it immedietly assigns |\catcode| values to
+the tokens read. So, if the correct |\catcode| values are not active
+at the time the arguments are scanned, \TeX\ is much confused.
+Consequently, macros that take as arguments greek text must be called
+from within greek mode. Having that in mind we can define a macro
+|\verse| that will correctly typeset one verse of the poem. The macro
+is defined as follows:
+\smallskip
+\hbox to\hsize{\hss|\def\verse#1#2{\line{#1\hfill#2}}|\hss}
+\smallskip
+\noindent It is assumed of course that the |\hsize| required
+for the document is already set. The rest is easy.
+\math\math
+\vbox{\narrower\narrower\parindent=0pt\obeylines
+ |$|
+ |\centerline{\bf PALAIOJEN ELLHNIS}|
+ |\smallskip|
+ |\verse{Kauqi'etai <h >Anti'oqeia}{gi`a t`a lampr'a thc kt'iria,}|
+ \centerline{\vdots}
+ |\verse{>apo'ikwn pr`oc tim`hn}{t~hc k'orhc to~u >In'aqou.}|
+ |\bigskip|
+ |\leftline{K. Kab'afhc}|
+ |$|}
+\math\math
+
+%% Begin Example macros
+{\setlatin % Switch to normal TeX Mode (Deactivate both | and $)
+\greekdelims{bar}
+\global\setbox\exbox=\vtop{\hrule height0pt
+\hrule\hbox{\vrule\kern6pt\vbox{\kern6pt%
+ \vbox{\hsize=9.6truecm\eightpoint
+ |\greightpoint\gr
+ \hbox to\hsize{\hfil {\tengri 7.2 T'o s'usthma K'entrou %
+M'azac 172}}
+ \bigskip
+ \noindent {\bf 7.2 To s'usthma k'entrou M'azac}
+ \medskip
+ E'inai suqn'a bolik'o na perigr'afetai h k'inhsh tou sust'hmatoc se
+ pla'isio anafor'ac sto opo'io to k'entro m'azac hreme'i sthn arq'h twn
+ ax'onwn. (Se barutik'o ped'io, to s'usthma aut'o e'inai epitagqun'omeno, mh
+ adraneiak'o, par'ola aut'a e'inai p'ali qr'hsimo.) Kale'itai to s'usthma
+ {\it k'entrou m'azac} (KM). Ja sumbol'izoume ta meg'ejh pou andaf'erontai
+ s''aut'o me 'enan aste\-r'i\-sko.
+
+ H sqetik'h j'esh $r$ e'inai b'ebaia anex'arthth ap'o to p'wc
+ epil'egetai h arq'h, 'etsi 'wste j'etontac $R^*=0$ st'hn
+ (7.7) br'iskoume
+ $${\lbf r}^*_1={m_2\over M}{\lbf r},\qquad {\lbf r}^*_2=-{m_1\over
+ M}{\lbf r}\eqno(7.12)$$
+ St'o s'usthma aut'o, oi orm'ec twn d'uo swmat'iwn e'inai
+ ('isec kai) ant'ijetec,
+ $$m_ir^*_i = -m_2r^*_2=\mu r = p^*\eqno(7.13)$$
+ 'Opwc ja do'ume kajar'a arg'otera, e'inai suqn'a bolik'o
+ na epil'uoume ena pr'oblhma pr'wta sto s'usthma KM. %Gia na
+% bro'ume thn l'ush se k'apoio 'allo
+% s'usthma, qreiaz'omaste t'ote tic sq'eseic an'amesa
+% stic orm'ec sta d'uo
+% sust'hmata. Ac jewr'hsoume 'ena s'usthma sto opo'io to k'entro m'azac
+% kine'itai me taq'uthta ${\lbf R}$. T'ote oi taq'uthtec twn d'uo
+% swmatid'iwn e'inai:
+ |
+ \smallskip
+ \hbox to\hsize{\hss\vdots\hss}
+ }
+ \kern6pt}\kern6pt\vrule}\hrule}
+}
+\lefthsize=\wd\exbox\advance\lefthsize by20pt%
+\exdepth=\dp\exbox\advance\exdepth by\ht\exbox
+%% End of example macros
+\exparagraph \tolerance=2000 Let us now turn to our second example which will demonstrate
+scientific typesetting in greek. The example is taken from the book
+{\it Classical Mechanics\/} by T.W.B. Kibble in its greek
+translation. Let us suppose that we are trying to typeset this book;
+how would we go about to build the macros needed? First of all we
+will be using a lot of math formulae and therefore we are in
+desperate need of the start and end math symbol. Since we are using
+modern greek and no iota ligatures are needed, we can redifine the
+bar {\tt\|} to stand for the begin and end greek by
+|\greekdelims{bar}|. This might turn out to be convenient if we
+want to include latin words in the text. Now for the macros.
+Starting with the
+headline appearing at the top of the page we need to define the
+|\headline| macro. This must be done within greek mode to correctly
+interprent the tokens scanned:
+\math\math
+\vbox{\parindent=0pt\obeylines
+|\begingreek|
+|\global\headline={\hfil {\git T'o s'usthma K'entrou M'azac}\ \folio}|
+|\endgreek|}
+\math\math
+It might be wiser to change the |\git| command either to
+|\grtenpoint\git| or |\tengri| to ensure that the correct font is
+selected when the output routine is called.
+
+To typeset math formulae you only have to use the standard \TeX\
+rules. Even within greek mode entering the math mode has exactly the
+same effect as from the plain \TeX\ mode. This is not entirely true
+since the font changing sequences are redefined. If you want boldface
+characters within the math mode you have to use the |\lbf| command
+and the same for any other family. See how is it really is:
+\math\math
+\vbox{\eightpoint\parindent=0pt\obeylines
+ |\hsize=12truecm|
+ |\begingreek|
+ |\grtenpoint % Switch to ten point characters|
+ |\gr % Default font|
+ |\noindent {\bf 7.2 To s'usthma k'entrou M'azac}|
+ |\medskip|
+ |E'inai suqn'a bolik'o na perigr'afetai h k'inhsh tou sust'hmatoc se|
+ |pla'isio anafor'ac sto opo'io to k'entro m'azac hreme'i sthn arq'h twn|
+ |ax'onwn. (Se barutik'o ped'io, to s'usthma aut'o e'inai epitagqun'omeno, mh|
+ |adraneiak'o, par'ola aut'a e'inai p'ali qr'hsimo.) Kale'itai to s'usthma|
+ |{\it k'entrou m'azac} (KM). Ja sumbol'izoume ta meg'ejh pou andaf'erontai|
+ |s''aut'o me 'enan aster'isko.|
+
+ |H sqetik'h j'esh $r$ e'inai b'ebaia anex'arthth ap'o to p'wc|
+ |epil'egetai h arq'h, 'etsi 'wste j'etontac $R^*=0$ st'hn|
+ |(7.7) br'iskoume|
+ |$${\lbf r}^*_1={m_2\over M}{\lbf r},|
+ | \qquad {\lbf r}^*_2=-{m_1\over M}{\lbf r}\eqno(7.12)$$|
+ |St'o s'usthma aut'o, oi orm'ec twn d'uo swmat'iwn e'inai |
+ |('isec kai) ant'ijetec,|
+ |$$m_ir^*_i = -m_2r^*_2=\mu r = p^*\eqno(7.13)$$|
+ |'Opwc ja do'ume kajar'a arg'otera, e'inai suqn'a bolik'o |
+ |na epil'uoume ena pr'oblhma pr'wta sto s'usthma KM.|
+ |\endgreek|
+}
+\math\math
+
+\section{Final Remarks}
+
+ Except from the macros explained above, the greek format also
+has a set ofgeneral use macros. It is possinble that in certain
+cases, greek mode will be the dominant mode. To switch to a permenant
+greek mode use the command |\setgreek|. If you want to restore the
+original \TeX\ mode (including restoring any reassignents of |$| or
+{\tt\|}) use the command |\setlatin|.
+\beginFine
+ These commands are based on the internal commands
+|\gr@@km@de| and |\l@tinmode|. Both define the |\catcode|s for the
+mode. A macro-builder can use them to create different environments
+e.g. a command to switch to english from a global greek mode. Just
+remeber that you will be on your own so you will have to switch to
+the enclish language manually by a command |\language0|.
+\endFine
+
+\bye
+