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