This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
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gives the numerator of expr.
  • Numerator picks out terms which do not have superficially negative exponents. Denominator picks out the remaining terms.
  • An exponent is "superficially negative" if it has a negative number as a factor.
  • The standard representation of rational expressions as products of powers means that you cannot simply use Part to extract numerators.
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