Top
Back: centerRed
Forward: centralizer
FastBack: bfun_lib
FastForward: dmod_lib
Up: central_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document
7.7.2.0. center
Procedure from library central.lib (see central_lib).

Usage:
center(D[, N]); D int, N optional int

Return:
ideal, generated by computed elements

Purpose:
computes subalgebra generators of the center up to degree D

Note:
In general, one cannot compute the whole center.
Hence, one has to specify a termination condition via arguments D and/or N.
If D is positive, only central elements up to degree D will be found.
If D is negative, the termination is determined by N only.
If N is given, the computation stops if at least N elements have been found.
Warning: if N is given and bigger than the actual number of generators,
the procedure may not terminate.
Current ordering must be a degree compatible well-ordering.

Example:
 
See also: centralizer; inCenter.


Top Back: centerRed Forward: centralizer FastBack: bfun_lib FastForward: dmod_lib Up: central_lib Top: Singular Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 3-1-6, Dec 2012, generated by texi2html.