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Annotation of 42BSD/usr.lib/learn/eqn/L5.1c, revision 1.1.1.1

1.1       root        1: #once #create message
                      2: .ND
                      3: .EQ
                      4: delim $$
                      5: .EN
                      6: .LP
                      7: Braces are an exceedingly useful construction.
                      8: Wherever you have a place where you could have used
                      9: a single thing like the letter "x", you can plug in
                     10: anything in braces, and the whole thing will
                     11: be positioned properly.  You can use braces with sub and sup
                     12: and over, and all the other magic words we
                     13: haven't seen yet.
                     14: 
                     15: First let's use braces with "over".
                     16: Modify "Example" to produce this output, then
                     17: type "ready".
                     18: (Recall that $partial$ is called "partial".)
                     19: .pl 1
                     20: #once #create Ref
                     21: .LP
                     22: .EQ
                     23: {partial y} over {partial x} ~=~ alpha over {alpha +1}
                     24: .EN
                     25: .pl 1
                     26: #once #create Example
                     27: .LP
                     28: .EQ
                     29: replace me
                     30: .EN
                     31: .pl 1
                     32: #
                     33: #once neqn Ref | nroff >X1 &
                     34: #once neqn message Ref | nroff -T$term %s/tinyms -
                     35: #user
                     36: neqn Example | nroff >X2
                     37: #cmp X1 X2
                     38: #log
                     39: #next
                     40: 5.1d 10

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