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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.
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- 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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