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unix v7是最后一个广泛发布的研究型UNIX版本

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\".ND "June 2, 1976"
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\".TM "76-1273-4 76-1271-4" 39199 39199-11
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Typesetting Mathematics _ User's Guide
\&\ \ \ \ \ (Second\ Edition)
.AU 2C-518 6021
Brian W. Kernighan and Lorinda L. Cherry
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.in
.ll
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This is the user's guide for a system for typesetting
mathematics,
using
the phototypesetters on the
.UX
and
.UC GCOS
operating systems.
.PP
Mathematical expressions are described in a language
designed to be easy to use
by people who know neither mathematics nor typesetting.
Enough of the language to set in-line expressions like
$lim from {x-> pi /2} ( tan~x) sup{sin~2x}~=~1$
or display equations like
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.EQ I
G(z)~mark =~ e sup { ln ~ G(z) }
~=~ exp left ( 
sum from k>=1 {S sub k z sup k} over k right )
~=~  prod from k>=1 e sup {S sub k z sup k /k}
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.EQ I
lineup = left ( 1 + S sub 1 z + 
{ S sub 1 sup 2 z sup 2 } over 2! + ... right )
left ( 1+ { S sub 2 z sup 2 } over 2
+ { S sub 2 sup 2 z sup 4 } over { 2 sup 2 cdot 2! }
+ ... right ) ...
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.EQ I
lineup =  sum from m>=0 left (
sum from
pile { k sub 1 ,k sub 2 ,..., k sub m  >=0
above
k sub 1 +2k sub 2 + ... +mk sub m =m}
{ S sub 1 sup {k sub 1} } over {1 sup k sub 1 k sub 1 ! } ~
{ S sub 2 sup {k sub 2} } over {2 sup k sub 2 k sub 2 ! } ~
...
{ S sub m sup {k sub m} } over {m sup k sub m k sub m ! } 
right ) z sup m
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can be learned in an hour or so.
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The language interfaces directly with
the phototypesetting language
.UC TROFF ,
so mathematical expressions can be embedded in the running
text
of a manuscript,
and the entire document produced in one process.
This user's guide is an example of its output.
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The same language
may be used with the 
.UC UNIX
formatter
.UC NROFF
to set mathematical expressions on 
.UC DASI
and
.UC GSI
terminals
and Model 37 teletypes.
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