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D.15.2.14 negativeformaldivisor
Procedure from library divisors.lib (see divisors_lib).
- Usage:
- negativeformaldivisor(A); A = formaldivisor.
- Assume:
- A is a formaldivisor on X.
- Return:
- a formal divisor on X
- Theory:
- The procedure will change the signs of the coefficients.
Example:
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