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1.1     ! root        1: .\"    @(#)e7  6.1 (Berkeley) 5/22/86
        !             2: .\"
        !             3: .NH
        !             4: Conclusions
        !             5: .PP
        !             6: We think we have shown that it is possible
        !             7: to do acceptably good typesetting of mathematics
        !             8: on a phototypesetter,
        !             9: with an input language that is easy to learn and use and
        !            10: that satisfies many users' demands.
        !            11: Such a package can be implemented in
        !            12: short order,
        !            13: given a compiler-compiler and
        !            14: a decent typesetting program underneath.
        !            15: .PP
        !            16: Defining a language, and building a compiler for it
        !            17: with a compiler-compiler
        !            18: seems like the only sensible way to do business.
        !            19: Our experience with the use of
        !            20: a grammar and a compiler-compiler has been
        !            21: uniformly favorable.
        !            22: If we had written everything into code directly,
        !            23: we would have been locked into
        !            24: our original design.
        !            25: Furthermore, we would have never been sure
        !            26: where the exceptions and special cases were.
        !            27: But because we have a grammar, we can change our minds readily and still be reasonably
        !            28: sure that if a construction works in one place
        !            29: it will work everywhere.
        !            30: .SH
        !            31: Acknowledgements
        !            32: .PP
        !            33: We are deeply indebted to
        !            34: J. F. Ossanna,
        !            35: the author of
        !            36: .UC TROFF ,
        !            37: for his willingness to modify
        !            38: .UC TROFF
        !            39: to make our task easier
        !            40: and for his continuous assistance
        !            41: during the development of our program.
        !            42: We are also grateful to
        !            43: A. V. Aho for help with language theory,
        !            44: to S. C. Johnson for aid with the compiler-compiler,
        !            45: and to our early users
        !            46: A. V. Aho, S. I. Feldman, S. C. Johnson,
        !            47: R. W. Hamming,
        !            48: and M. D. McIlroy
        !            49: for their constructive criticisms.
        !            50: .SH
        !            51: References
        !            52: .IP [1]
        !            53: .ul
        !            54: A Manual of Style,
        !            55: 12th Edition.
        !            56: University of Chicago Press, 1969. p 295.
        !            57: .IP [2]
        !            58: .ul
        !            59: Model C/A/T Phototypesetter.
        !            60: Graphic Systems, Inc.,
        !            61: Hudson, N. H.
        !            62: .IP [3]
        !            63: Ritchie, D. M., and Thompson, K. L.,
        !            64: ``The UNIX time-sharing system.''
        !            65: \fIComm. ACM 17,\fR 7 (July 1974), 365-375.
        !            66: .IP [4]
        !            67: Ossanna, J. F.,
        !            68: TROFF User's Manual.
        !            69: Bell Laboratories Computing Science Technical Report 54, 1977.
        !            70: .IP [5]
        !            71: Aho, A. V., and Johnson, S. C.,
        !            72: ``LR Parsing.''
        !            73: \fIComp. Surv. 6,\fR 2 (June 1974), 99-124.
        !            74: .br
        !            75: .IP [6]
        !            76: B. W. Kernighan and D. M. Ritchie,
        !            77: .ul
        !            78: The C Programming Language.
        !            79: Prentice-Hall, Inc., 1978.

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