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Annotation of 43BSDTahoe/usr.lib/learn/eqn/L12.1a, 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 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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