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D.6.15.15 tjurina

Procedure from library sing.lib (see sing_lib).

Usage:
tjurina(id); id=ideal or poly

Assume:
id=ICIS (isolated complete intersection singularity)

Return:
int = Tjurina number of id

Note:
Tjurina number = -1 implies that id is not an ICIS

Example:
 
LIB "sing.lib";
ring r=32003,(x,y,z),(c,ds);
ideal j=x2+y2+z2,x2+2y2+3z2;
tjurina(j);
==> 5