BUILT-IN MATHEMATICA SYMBOL
Numerator
- 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.
- Numerator can be used on rational numbers.
Extract the numerator of a rational number:
| Out[1]= |  |
Extract the numerator of a rational expression:
| Out[2]= |  |
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