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Annotation of 42BSD/usr.lib/learn/eqn/L2.1c, revision 1.1.1.1

1.1       root        1: #once #create message
                      2: .nf
                      3: .EQ
                      4: delim $$
                      5: .EN
                      6: Several of the examples we did earlier had Greek letters
                      7: and other mathematical symbols in them.
                      8: The way to get things like $pi$ and $sum$ and $int$ is
                      9: rather easy - you just spell out their names, like this:
                     10: 
                     11: $pi$ is pi
                     12: 
                     13: $sum$ is sum
                     14: 
                     15: $int$ is int
                     16: 
                     17: and so on.
                     18: The main thing you must always remember about these names
                     19: is that when they appear in an equation, they must be
                     20: separated from surrounding symbols by blanks or tildes,
                     21: OR THEY WILL NOT BE RECOGNIZED.
                     22: 
                     23: For practice, modify "Example" so the symbol $partial$
                     24: is replaced by $sum$ everywhere it appears.
                     25: Type "ready" when you're done.
                     26: .pl 1
                     27: #once #create Ref
                     28: .PP
                     29: The symbol
                     30: .EQ
                     31: sum
                     32: .EN
                     33: often appears in lines like
                     34: .EQ
                     35: { sum x } over { sum y } = y over x
                     36: .EN
                     37: .pl 1
                     38: #
                     39: #once neqn Ref | nroff >X1  &
                     40: #once neqn message | nroff -T$term
                     41: #once #create Example
                     42: .PP
                     43: The symbol
                     44: .EQ
                     45: partial
                     46: .EN
                     47: often appears in lines like
                     48: .EQ
                     49: { partial x } over { partial y } = y over x
                     50: .EN
                     51: .pl 1
                     52: #user
                     53: neqn Example | nroff >X2
                     54: #cmp X1 X2
                     55: #log
                     56: #next
                     57: 2.1d 10

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