Dicyclic group:Dic20

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This group is defined as the dicyclic group of order 20, and hence degree 5. In other words, it has the presentation:

\langle a,b,c \mid a^5 = b^2 = c^2 = abc \rangle

Alternatively, it has the presentation:

\langle a,b,c \mid a^{10} = b^4 = e, bab^{-1} = a^{-1} \rangle.

Arithmetic functions

Function Value Explanation
order 20
exponent 10
Frattini length 2
derived length 2
nilpotency class -- Not a nilpotent group.
minimum size of generating set 2
subgroup rank 2

Group properties

Property Satisfied Explanation
cyclic group No
abelian group No
nilpotent group No
metacyclic group Yes
supersolvable group Yes
solvable group Yes
ambivalent group No

GAP implementation

Group ID

This finite group has order 20 and has ID 1 among the groups of order 20 in GAP's SmallGroup library. For context, there are 5 groups of order 20. It can thus be defined using GAP's SmallGroup function as:


For instance, we can use the following assignment in GAP to create the group and name it G:

gap> G := SmallGroup(20,1);

Conversely, to check whether a given group G is in fact the group we want, we can use GAP's IdGroup function:

IdGroup(G) = [20,1]

or just do:


to have GAP output the group ID, that we can then compare to what we want.