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Annotation of 43BSDReno/share/doc/usd/26.eqn/e2, revision 1.1

1.1     ! root        1: .\"    @(#)e2  6.1 (Berkeley) 5/22/86
        !             2: .\"
        !             3: .NH
        !             4: Photocomposition
        !             5: .PP
        !             6: Photocomposition techniques
        !             7: can be used to solve some of the problems of typesetting mathematics.
        !             8: A phototypesetter is a device which exposes
        !             9: a piece of photographic paper or film, placing characters
        !            10: wherever they are wanted.
        !            11: The Graphic Systems phototypesetter[2] on the
        !            12: .UC UNIX
        !            13: operating
        !            14: system[3] works by shining light through a character stencil.
        !            15: The character is made the right size by lenses,
        !            16: and the light beam directed by fiber optics
        !            17: to the desired place on a piece of photographic paper.
        !            18: The exposed paper is developed and typically used
        !            19: in some form of photo-offset reproduction.
        !            20: .PP
        !            21: On
        !            22: .UC UNIX ,
        !            23: the phototypesetter is driven by a formatting program called
        !            24: .UC TROFF
        !            25: [4].
        !            26: .UC TROFF
        !            27: was designed for setting running text.
        !            28: It also provides all of the facilities that one needs for
        !            29: doing mathematics, such as
        !            30: arbitrary horizontal and vertical motions,
        !            31: line-drawing, size changing,
        !            32: but the syntax for describing these special operations is
        !            33: difficult to learn,
        !            34: and difficult even for experienced users to type correctly.
        !            35: .PP
        !            36: For this reason we decided to use
        !            37: .UC TROFF
        !            38: as an ``assembly language,''
        !            39: by
        !            40: designing a language for describing mathematical
        !            41: expressions,
        !            42: and compiling it into
        !            43: .UC TROFF .

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