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Annotation of 42BSD/usr.lib/learn/eqn/L3.1a, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .PP
        !             4: Now that we have some of the preliminaries out of the way,
        !             5: we can get on to doing real mathematics.
        !             6: I have been slipping small things into the example files
        !             7: as we go along so that you will at least have seen
        !             8: some common neqn constructions.
        !             9: 
        !            10: One of the most frequent is the word "sub", which
        !            11: indicates a subscript, like this:
        !            12: 
        !            13:    .EQ
        !            14:    x sub i + y sub j
        !            15:    .EN
        !            16: 
        !            17: which produces
        !            18: .EQ
        !            19: x sub i + y sub j
        !            20: .EN
        !            21: The main thing to notice is that the blanks are delimiters -
        !            22: the subscript of "x" is "i"; the blank after the "i" marks
        !            23: the end of the subscript.
        !            24: 
        !            25: Modify the file "Example" so the equation in it looks like
        !            26: this:
        !            27: .EQ
        !            28: x sub alpha ~=~ y sub pi ~+~ z sub pi
        !            29: .EN
        !            30: Then type "ready".
        !            31: .pl 1
        !            32: #once #create Ref
        !            33: .LP
        !            34: .EQ
        !            35: x sub alpha ~=~ y sub pi ~+~ z sub pi
        !            36: .EN
        !            37: .pl 1
        !            38: #once #create Example
        !            39: .LP
        !            40: .EQ
        !            41: xxx
        !            42: .EN
        !            43: .pl 1
        !            44: #
        !            45: #once neqn Ref | nroff >X1 &
        !            46: #once neqn message | nroff -T$term %s/tinyms -
        !            47: #user
        !            48: neqn Example | nroff >X2
        !            49: #cmp X1 X2
        !            50: #log
        !            51: #next
        !            52: 3.1b 10
        !            53: 3.2a 5

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