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Annotation of 42BSD/usr.lib/learn/eqn/L1.1b, revision 1.1.1.1

1.1       root        1: #print
                      2: Most technical papers and memos consist of normal text
                      3: interspersed with occasional (or frequent) mathematical
                      4: expressions, such as the ones in the last lesson.
                      5: To tell neqn that something is mathematics, not normal
                      6: text, you must surround it by two "commands":
                      7: 
                      8:    A line that begins with
                      9:    .EQ
                     10:    marks the start of an expression.
                     11: 
                     12:    A line that begins with
                     13:    .EN
                     14:    marks the end of the expression.
                     15: 
                     16: Thus, the lines
                     17: .EQ
                     18: x=y+1
                     19: .EN
                     20: represent the equation
                     21: 
                     22: x=y+1
                     23: 
                     24: The file "Example" in this directory has a line that contains
                     25: + and - signs.  Make that line into an equation
                     26: by adding .EQ and .EN before and after.
                     27: Print "Example" with neqn and nroff (and the appropriate -Txxx),
                     28: then type "ready".
                     29: #once #create Ref
                     30: This is a tiny little text
                     31: that includes one equation
                     32: or at least it will when you find this line:
                     33: .ce
                     34: .EQ
                     35: a = b + c - d
                     36: .EN
                     37: and convert it into an equation.
                     38: .pl 1
                     39: #once #create Example
                     40: This is a tiny little text
                     41: that includes one equation
                     42: or at least it will when you find this line:
                     43: .ce
                     44: a = b + c - d
                     45: and convert it into an equation.
                     46: .pl 1
                     47: #user
                     48: #cmp Ref Example
                     49: #log
                     50: #next
                     51: 1.1c 10

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