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Annotation of 42BSD/usr.lib/learn/eqn/L7.1a, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .tr %$
        !             4: .EQ
        !             5: delim $$
        !             6: .EN
        !             7: .LP
        !             8: The next construction we're going to look at
        !             9: is one for putting things above and below other
        !            10: things, in a rather specialized way.
        !            11: For example, if you want something like
        !            12: .EQ
        !            13: sum from i to j
        !            14: .EN
        !            15: you type
        !            16:   .EQ
        !            17:   sum from i to j
        !            18:   .EN
        !            19: The words "from" and "to" are more magic, like
        !            20: sub or sup or over.  The "from" part is centered
        !            21: under the main piece; the "to" part is centered
        !            22: above it.
        !            23: As a warmup, modify "Example" so it produces
        !            24: output that looks like the following, then type
        !            25: ready.
        !            26: .pl 1
        !            27: #once #create Ref
        !            28: .EQ
        !            29: delim $$
        !            30: .EN
        !            31: .LP
        !            32: Let $Q( pi )$ be $sum from {i= pi sub 1} to {i= pi sub 2} x sub i$.
        !            33: .pl 1
        !            34: #once #create Example
        !            35: .EQ
        !            36: delim $$
        !            37: .EN
        !            38: .LP
        !            39: Let $Q( pi )$ be $sum {i= pi sub 1} {i= pi sub 2} x sub i$.
        !            40: .pl 1
        !            41: #
        !            42: #once neqn Ref | nroff >X1 &
        !            43: #once neqn message Ref | nroff -T$term %s/tinyms -
        !            44: #user
        !            45: neqn Example | nroff >X2
        !            46: #cmp X1 X2
        !            47: #log
        !            48: #next
        !            49: 7.1b 10

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