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Annotation of 43BSD/usr.lib/learn/eqn/L11.1a, 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: We have introduced a fair number of "magic" words like
                      9: sub and sup and over and pi and sum.  What happens if
                     10: you need to print an equation that contains one of these
                     11: words __as ____text, like this:
                     12: .EQ
                     13: e sub "pi"
                     14: .EN
                     15: 
                     16: The way to turn off special meanings of magic words is
                     17: to enclose them in the double quotes "...".  The $e sub "pi"$
                     18: was printed with
                     19:   .EQ
                     20:   e sub "pi"
                     21:   .EN
                     22: 
                     23: Using this knowledge, modify file "Example" so it produces output
                     24: that looks like the following, then type "ready".
                     25: .pl 1
                     26: #once #create Ref
                     27: .LP
                     28: .EQ
                     29: lim "sup" f( "pi" ) = p cdot i
                     30: .EN
                     31: .pl 1
                     32: #once #create Example
                     33: .LP
                     34: .EQ
                     35: lim sup f( pi ) = p cdot i
                     36: .EN
                     37: .pl 1
                     38: #
                     39: #once neqn Ref | nroff >X1 &
                     40: #once neqn message Ref | nroff -T$term %s/tinyms -
                     41: #user
                     42: neqn Example | nroff >X2
                     43: #cmp X1 X2
                     44: #log
                     45: #next
                     46: 11.1b 10

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