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D.4.18.2 primdecGTZ

Procedure from library primdec.lib (see primdec_lib).

Usage:
primdecGTZ(i); i ideal

Return:
a list pr of primary ideals and their associated primes:
 
   pr[i][1]   the i-th primary component,
   pr[i][2]   the i-th prime component.

Note:
- Algorithm of Gianni/Trager/Zacharias.
- Designed for characteristic 0, works also in char k > 0, if it terminates (may result in an infinite loop in small characteristic!) - For local orderings, the result is considered in the localization of the polynomial ring, not in the power series ring
- For local and mixed orderings, the decomposition in the corresponding global ring is returned if the string 'global' is specified as second argument

Example:
 


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