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Annotation of 42BSD/usr.lib/learn/eqn/L3.1a, revision 1.1.1.1

1.1       root        1: #once #create message
                      2: .ND
                      3: .PP
                      4: Now that we have some of the preliminaries out of the way,
                      5: we can get on to doing real mathematics.
                      6: I have been slipping small things into the example files
                      7: as we go along so that you will at least have seen
                      8: some common neqn constructions.
                      9: 
                     10: One of the most frequent is the word "sub", which
                     11: indicates a subscript, like this:
                     12: 
                     13:    .EQ
                     14:    x sub i + y sub j
                     15:    .EN
                     16: 
                     17: which produces
                     18: .EQ
                     19: x sub i + y sub j
                     20: .EN
                     21: The main thing to notice is that the blanks are delimiters -
                     22: the subscript of "x" is "i"; the blank after the "i" marks
                     23: the end of the subscript.
                     24: 
                     25: Modify the file "Example" so the equation in it looks like
                     26: this:
                     27: .EQ
                     28: x sub alpha ~=~ y sub pi ~+~ z sub pi
                     29: .EN
                     30: Then type "ready".
                     31: .pl 1
                     32: #once #create Ref
                     33: .LP
                     34: .EQ
                     35: x sub alpha ~=~ y sub pi ~+~ z sub pi
                     36: .EN
                     37: .pl 1
                     38: #once #create Example
                     39: .LP
                     40: .EQ
                     41: xxx
                     42: .EN
                     43: .pl 1
                     44: #
                     45: #once neqn Ref | nroff >X1 &
                     46: #once neqn message | nroff -T$term %s/tinyms -
                     47: #user
                     48: neqn Example | nroff >X2
                     49: #cmp X1 X2
                     50: #log
                     51: #next
                     52: 3.1b 10
                     53: 3.2a 5

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