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Annotation of 42BSD/usr.lib/learn/eqn/L12.1a, 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 step is to learn how to put big parentheses,
                      9: brackets, braces or bars around equations, like this:
                     10: .EQ
                     11: left | a sup 2 over b sub i right |
                     12: .EN
                     13: 
                     14: This is done with two new words called "left" and "right".
                     15: To put bars around something, you simply say, in the middle
                     16: of an equation,
                     17:   left |  something  right |
                     18: and the job is done.
                     19: "something" can indeed be anything, from a single letter
                     20: up to some horribly complicated mess.
                     21: The bars grow to the right height to cover the
                     22: "something", automatically.
                     23: To produce the example above, all that was needed was
                     24:    .EQ
                     25:    left | a sup 2 over b sub i right |
                     26:    .EN
                     27: 
                     28: For practice, modify file "Example" so it produces output
                     29: that looks like this, then type "ready".
                     30: .pl 1
                     31: #once #create Ref
                     32: .LP
                     33: .EQ
                     34: left |
                     35: {a over b ~+~ c over d} over 2
                     36: right |
                     37: .EN
                     38: .pl 1
                     39: #once #create Example
                     40: .LP
                     41: .EQ
                     42: replace me
                     43: .EN
                     44: .pl 1
                     45: #
                     46: #once neqn Ref | nroff >X1 &
                     47: #once neqn message Ref | nroff -T$term %s/tinyms -
                     48: #user
                     49: neqn Example | nroff >X2
                     50: #cmp X1 X2
                     51: #log
                     52: #next
                     53: 12.1b 10

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