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