Difference between revisions of "ApCoCoA-1:Ikosaeder group"
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| − | === <div id="Ikosaeder group">[[:ApCoCoA:Symbolic data#Ikosaeder_group|Ikosaeder | + | === <div id="Ikosaeder group">[[:ApCoCoA:Symbolic data#Ikosaeder_group|Ikosaeder Group]]</div> === |
==== Description ==== | ==== Description ==== | ||
The Ikosaeder group has the following representation: | The Ikosaeder group has the following representation: | ||
| Line 29: | Line 29: | ||
Relations:=CreateRelationsIkosaeder(); | Relations:=CreateRelationsIkosaeder(); | ||
Gb:=NC.GB(Relations); | Gb:=NC.GB(Relations); | ||
| + | ====Example in Symbolic Data Format==== | ||
| + | <FREEALGEBRA createdAt="2014-01-20" createdBy="strohmeier"> | ||
| + | <vars>a,b</vars> | ||
| + | <basis> | ||
| + | <ncpoly>a*a-1</ncpoly> | ||
| + | <ncpoly>b*b*b-1</ncpoly> | ||
| + | <ncpoly>a*b*a*b*a*b*a*b*a*b-1</ncpoly> | ||
| + | </basis> | ||
| + | <Comment>Ikosaeder_group</Comment> | ||
| + | </FREEALGEBRA> | ||
Latest revision as of 21:00, 22 April 2014
Description
The Ikosaeder group has the following representation:
I = <a,b | a^2 = b^3 = (ab)^5 = 1>
Reference
Eric W. Weisstein: Math World, Icosahedral Group
Computation
/*Use the ApCoCoA package ncpoly.*/
Use ZZ/(2)[a,b];
NC.SetOrdering("LLEX");
Define CreateRelationsIkosaeder()
Relations:=[];
// add the relation a^2 = 1
Append(Relations,[[a^2],[1]]);
// add the relation b^3 = 1
Append(Relations,[[b^3],[1]]);
// add the relation (ab)^5 = 1
Append(Relations,[[a,b,a,b,a,b,a,b,a,b],[1]]);
Return Relations;
EndDefine;
Relations:=CreateRelationsIkosaeder();
Gb:=NC.GB(Relations);
Example in Symbolic Data Format
<FREEALGEBRA createdAt="2014-01-20" createdBy="strohmeier"> <vars>a,b</vars> <basis> <ncpoly>a*a-1</ncpoly> <ncpoly>b*b*b-1</ncpoly> <ncpoly>a*b*a*b*a*b*a*b*a*b-1</ncpoly> </basis> <Comment>Ikosaeder_group</Comment> </FREEALGEBRA>
