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Annotation of 43BSD/usr.lib/learn/eqn/L8.1a, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .LP
        !             4: The next neqn operation is called "sqrt" - it makes
        !             5: square root signs over things, like this:
        !             6: .EQ
        !             7: sqrt a+b
        !             8: .EN
        !             9: (They don't look very good on a terminal, unfortunately.)
        !            10: This one is very easy - to print the line above, you
        !            11: say
        !            12:    .EQ
        !            13:    sqrt a+b
        !            14:    .EN
        !            15: The "sqrt" operates on the first thing it finds
        !            16: so if you want something more complicated, like
        !            17: .EQ
        !            18: sqrt {pi +1}
        !            19: .EN
        !            20: you have to use braces to enclose the entire
        !            21: thing.  This one was printed with
        !            22:    .EQ
        !            23:    sqrt {pi +1}
        !            24:    .EN
        !            25: And that's all there is to sqrt.
        !            26: 
        !            27: Modify "Example" so it looks like this, then type "ready".
        !            28: .pl 1
        !            29: #once #create Ref
        !            30: .LP
        !            31: .EQ
        !            32: f(x) ~=~ sqrt {ax sup 2 +bx+c}
        !            33: .EN
        !            34: .pl 1
        !            35: #once #create Example
        !            36: .LP
        !            37: .EQ
        !            38: f(x)....
        !            39: .EN
        !            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: 8.1b 10

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