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Annotation of 42BSD/usr.lib/learn/eqn/L5.1h, revision 1.1

1.1     ! root        1: #once #create message
        !             2: .ND
        !             3: .tr %$
        !             4: .EQ
        !             5: delim $$
        !             6: .EN
        !             7: .LP
        !             8: One thing that you will occasionally need
        !             9: is to be able to get a literal { or } in your
        !            10: output, for an expression like
        !            11: .EQ
        !            12: { "{" a + b "}" } over 2
        !            13: .EN
        !            14: The way to do this is to place the braces
        !            15: that are really to appear ______inside ______quotes,
        !            16: like this:
        !            17:    .EQ
        !            18:    { "{" a + b "}" } over 2
        !            19:    .EN
        !            20: .br
        !            21: The quotes temporarily turn off the special meaning
        !            22: of the braces so that you can have them printed.
        !            23: 
        !            24: The file "Example" has a lot of square brackets in
        !            25: it.  Modify them so they are all braces when they are
        !            26: printed - so they look like this - then type "ready".
        !            27: .pl 1
        !            28: #once #create Ref
        !            29: .LP
        !            30: .EQ
        !            31: f"{" x sub 1 ,..., x sub n "}" ~=~ "{" x sub 1 ,..., x sub n "}"
        !            32: .EN
        !            33: .pl 1
        !            34: #once #create Example
        !            35: .LP
        !            36: .EQ
        !            37: f[ x sub 1 ,..., x sub n ] ~=~ [ x sub 1 ,..., x sub n ]
        !            38: .EN
        !            39: .pl 1
        !            40: #
        !            41: #once neqn Ref | nroff >X1 &
        !            42: #once neqn message Ref | nroff -T$term %s/tinyms -
        !            43: #user
        !            44: neqn Example | nroff >X2
        !            45: #cmp X1 X2
        !            46: #log
        !            47: #next
        !            48: 6.1a 10

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