Difference between revisions of "ApCoCoA-1:Cyclic groups"

From ApCoCoAWiki
Line 27: Line 27:
 
    
 
    
 
   // Compute the Groebner Bases
 
   // Compute the Groebner Bases
 +
  GB:=NC.GB(Relations);
 +
  //  RESULT :: [[[a^5], [1]]]

Revision as of 07:38, 13 August 2013

Description

Every cyclic group is generated by a single element a. If n is finite the group is isomorphic to Z/nZ, otherwise it can be interpreted as Z with the addition of integers as the group operation. For every cyclic group there only exists one subgroup containing a, the group itself.

C(n) = <a | a^{n} = 1>

(Reference: Gallian, Joseph (1998), Contemporary abstract algebra (4th ed.), Boston: Houghton Mifflin, Chapter 4

Computation

 /*Use the ApCoCoA package ncpoly.*/
 
 // Number of cyclic group
 MEMORY.N:=5;
 
 Use ZZ/(2)[a];
 NC.SetOrdering("LLEX");
 Define CreateRelationsCyclic()
 Relations:=[];
 
 // add relation a^n = 1
 Append(Relations,[[a^MEMORY.N],[-1]]);
 Return Relations;
 EndDefine;
 
 Relations:=CreateRelationsCyclic();
 
 // Compute the Groebner Bases
 GB:=NC.GB(Relations);
 //  RESULT :: [[[a^5], [1]]]