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

1.1       root        1: #once #create message
                      2: .ND
                      3: .EQ
                      4: delim $$
                      5: .EN
                      6: .LP
                      7: You will get lots of practice
                      8: using braces as we go along.
                      9: One thing to keep in mind is that
                     10: braces can appear ______within braces.
                     11: (Remember that I said that anywhere you
                     12: could use an "x" you could put something in
                     13: braces instead.  So to get this:
                     14: .EQ
                     15: e sup {x sup {pi +1} + y sup {pi +1}}
                     16: .EN
                     17: you can type
                     18: 
                     19:   e sup {x sup {pi +1} + y sup {pi +1}}
                     20: 
                     21: The big superscript (the one on the "e") has
                     22: a pair of braces that take in everything.
                     23: Then the "x" and the "y" each have braces
                     24: to delimit their superscripts.
                     25: Of course the braces have to go in the right
                     26: places, or you won't get the output you
                     27: want.
                     28: 
                     29: To verify that you are still following this
                     30: lesson, modify "Example" so it looks like
                     31: this, then type "ready".
                     32: .pl 1
                     33: #once #create Ref
                     34: .LP
                     35: .EQ
                     36: e sup {{x sup {pi +1} + y sup {pi +1}} over 2}
                     37: .EN
                     38: .pl 1
                     39: #once #create Example
                     40: .LP
                     41: .EQ
                     42: e sup {x sup {pi +1} + y sup {pi +1}}
                     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: #fail
                     52: Don't forget that you need braces for the overall superscript,
                     53: and also for the "over" part.
                     54: #log
                     55: #next
                     56: 5.1e 10
                     57: 5.2d 5

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