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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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