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1.1     ! root        1: .\"    @(#)e0  6.1 (Berkeley) 5/22/86
        !             2: .\"
        !             3: .EH 'USD:26-%''A System for Typesetting Mathematics'
        !             4: .OH 'A System for Typesetting Mathematics''USD:26-%'
        !             5: .nr PS 9
        !             6: .nr VS 11
        !             7: ....ND "Revised  April, 1977"
        !             8: .EQ
        !             9: delim $$
        !            10: gsize 9
        !            11: .EN
        !            12: ....TR 17
        !            13: .TL
        !            14: A System for Typesetting Mathematics
        !            15: .AU
        !            16: Brian W. Kernighan and Lorinda L. Cherry
        !            17: .AI
        !            18: .MH
        !            19: .AB
        !            20: .PP
        !            21: This paper describes the design and implementation
        !            22: of a system for typesetting mathematics.
        !            23: The language has been designed to be easy to learn
        !            24: and to use
        !            25: by people
        !            26: (for example, secretaries and mathematical typists)
        !            27: who know neither mathematics nor typesetting.
        !            28: Experience indicates that the language can
        !            29: be learned in an hour or so,
        !            30: for it has few rules and fewer exceptions.
        !            31: For typical expressions,
        !            32: the size and font changes, positioning, line drawing,
        !            33: and the like necessary to print according to mathematical conventions
        !            34: are all done automatically.
        !            35: For example,
        !            36: the input
        !            37: .sp 4p
        !            38: .ce
        !            39: sum from i=0 to infinity x sub i = pi over 2
        !            40: .sp 4p
        !            41: produces
        !            42: .EQ
        !            43: sum from i=0 to infinity x sub i = pi over 2
        !            44: .EN
        !            45: .PP
        !            46: The syntax of the language is specified by a small
        !            47: context-free grammar;
        !            48: a compiler-compiler is used to make a compiler
        !            49: that translates this language into typesetting commands.
        !            50: Output may be produced on either a phototypesetter
        !            51: or on a terminal with forward and reverse half-line motions.
        !            52: The system interfaces directly with text formatting programs,
        !            53: so mixtures of text and mathematics may be handled simply.
        !            54: .LP
        !            55: .LP
        !            56: .PP
        !            57: This paper is a revision of a paper originally published in
        !            58: CACM, March, 1975.
        !            59: .AE

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