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  Argument
 
    number         Real expression
 
  Returns
 
    <real type>    Natural logarithm of number
 
  Description
 
    The Ln function returns the natural logarithm of a real number.
    A natural logarithm is a logarithm to the base e.
 
    The mathematical constant e is the base of the natural logarithms,
    and is approximately 2.71828182845905.
 
    If the argument is negative or zero, a run-time error occurs.