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Annotation of 43BSDTahoe/usr.lib/learn/eqn/L7.1a, revision 1.1.1.1

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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