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5.33.2  Numerator after simplification: numer

numer takes as argument a rational fraction and returns the numerator of the irreducible representation of this fraction (see also 5.8.3).
Input:

numer((x^2-1)/(x-1))

Output:

x+1

Input:

numer((x^2+2*x+1)/(x^2-1))

Output:

x+1

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