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.NHPhotocomposition.PPPhotocomposition techniquescan be used to solve some of the problems of typesetting mathematics.A phototypesetter is a device which exposesa piece of photographic paper or film, placing characterswherever they are wanted.The Graphic Systems phototypesetter[2] on the.UC UNIXoperatingsystem[3] works by shining light through a character stencil.The character is made the right size by lenses,and the light beam directed by fiber opticsto the desired place on a piece of photographic paper.The exposed paper is developed and typically usedin some form of photo-offset reproduction..PPOn.UC UNIX ,the phototypesetter is driven by a formatting program called.UC TROFF[4]..UC TROFFwas designed for setting running text.It also provides all of the facilities that one needs fordoing mathematics, such asarbitrary horizontal and vertical motions,line-drawing, size changing,but the syntax for describing these special operations isdifficult to learn,and difficult even for experienced users to type correctly..PPFor this reason we decided to use.UC TROFFas an ``assembly language,''bydesigning a language for describing mathematicalexpressions,and compiling it into.UC TROFF .
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