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D.4.15.14 changeDenominator

Procedure from library normal.lib (see normal_lib).

Usage:
changeDenominator(U1, c1, c2, I); U1 and I ideals, c1 and c2 polynomials.

Return:
an ideal U2 such that the A-modules 1/c1 * U1 and 1/c2 * U2 are equal, where A = R/I and R is the basering.

Note:
It assumes that such U2 exists. It is intended maninly as an auxiliary procedure in the normalization algorithms.

Example:
 

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