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D.6.13.14 Tjurina

Procedure from library sing.lib (see sing_lib).

Usage:
Tjurina(id[,<any>]); id=ideal or poly

Assume:
id=ICIS (isolated complete intersection singularity)

Return:
standard basis of Tjurina-module of id,
of type module if id=ideal, resp. of type ideal if id=poly. If a second argument is present (of any type) return a list:
[1] = Tjurina number,
[2] = k-basis of miniversal deformation,
[3] = SB of Tjurina module,
[4] = Tjurina module

Display:
Tjurina number if printlevel >= 0 (default)

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

Example:
 


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            User manual for Singular version 3-1-6, Dec 2012, generated by texi2html.