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D.4.26.8 minAssChar
Procedure from library primdec.lib (see primdec_lib).
- Usage:
- minAssChar(I[,c]); i ideal, c int (optional).
- Return:
- list, the minimal associated prime ideals of I. If I is the unit ideal returns list( ideal(1) )
- Note:
- If c=0, the given ordering of the variables is used.
Otherwise, the system tries to find an optimal ordering,
which in some cases may considerably speed up the algorithm.
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 third argument
Example:
| | LIB "primdec.lib";
ring r = 0,(x,y,z),dp;
poly p = z2+1;
poly q = z3+2;
ideal i = p*q^2,y-z2;
list pr = minAssChar(i);
pr;
==> [1]:
==> _[1]=y+1
==> _[2]=z2+1
==> [2]:
==> _[1]=z2-y
==> _[2]=yz+2
==> _[3]=y2+2z
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