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Properties

Label 8T13
8T13 1 2 1->2 3 1->3 5 1->5 8 1->8 2->3 2->3 6 2->6 2->8 3->1 7 3->7 4 4->5 4->6 4->6 4->8 5->4 5->7 6->5 6->7
Degree $8$
Order $24$
Cyclic no
Abelian no
Solvable yes
Transitivity $1$
Primitive no
$p$-group no
Group: $A_4\times C_2$

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Show commands: Gap / Magma / Oscar / SageMath

Copy content comment:Define the Galois group
 
Copy content magma:G := TransitiveGroup(8, 13);
 
Copy content sage:G = TransitiveGroup(8, 13)
 
Copy content oscar:G = transitive_group(8, 13)
 
Copy content gap:G := TransitiveGroup(8, 13);
 

Group invariants

Abstract group:  $A_4\times C_2$
Copy content comment:Abstract group ID
 
Copy content magma:IdentifyGroup(G);
 
Copy content sage:G.id()
 
Copy content oscar:small_group_identification(G)
 
Copy content gap:IdGroup(G);
 
Order:  $24=2^{3} \cdot 3$
Copy content comment:Order
 
Copy content magma:Order(G);
 
Copy content sage:G.order()
 
Copy content oscar:order(G)
 
Copy content gap:Order(G);
 
Cyclic:  no
Copy content comment:Determine if group is cyclic
 
Copy content magma:IsCyclic(G);
 
Copy content sage:G.is_cyclic()
 
Copy content oscar:is_cyclic(G)
 
Copy content gap:IsCyclic(G);
 
Abelian:  no
Copy content comment:Determine if group is abelian
 
Copy content magma:IsAbelian(G);
 
Copy content sage:G.is_abelian()
 
Copy content oscar:is_abelian(G)
 
Copy content gap:IsAbelian(G);
 
Solvable:  yes
Copy content comment:Determine if group is solvable
 
Copy content magma:IsSolvable(G);
 
Copy content sage:G.is_solvable()
 
Copy content oscar:is_solvable(G)
 
Copy content gap:IsSolvable(G);
 
Nilpotency class:   not nilpotent
Copy content comment:Nilpotency class
 
Copy content magma:NilpotencyClass(G);
 
Copy content sage:libgap(G).NilpotencyClassOfGroup() if G.is_nilpotent() else -1
 
Copy content oscar:if is_nilpotent(G) nilpotency_class(G) end
 
Copy content gap:if IsNilpotentGroup(G) then NilpotencyClassOfGroup(G); fi;
 

Group action invariants

Degree $n$:  $8$
Copy content comment:Degree
 
Copy content magma:t, n := TransitiveGroupIdentification(G); n;
 
Copy content sage:G.degree()
 
Copy content oscar:degree(G)
 
Copy content gap:NrMovedPoints(G);
 
Transitive number $t$:  $13$
Copy content comment:Transitive number
 
Copy content magma:t, n := TransitiveGroupIdentification(G); t;
 
Copy content sage:G.transitive_number()
 
Copy content oscar:transitive_group_identification(G)[2]
 
Copy content gap:TransitiveIdentification(G);
 
CHM label:   $E(8):3=A(4)[x]2$
Parity:  $1$
Copy content comment:Parity
 
Copy content magma:IsEven(G);
 
Copy content sage:all(g.SignPerm() == 1 for g in libgap(G).GeneratorsOfGroup())
 
Copy content oscar:is_even(G)
 
Copy content gap:ForAll(GeneratorsOfGroup(G), g -> SignPerm(g) = 1);
 
Transitivity:  1
Primitive:  no
Copy content comment:Determine if group is primitive
 
Copy content magma:IsPrimitive(G);
 
Copy content sage:G.is_primitive()
 
Copy content oscar:is_primitive(G)
 
Copy content gap:IsPrimitive(G);
 
$\card{\Aut(F/K)}$:  $2$
Copy content comment:Order of the centralizer of G in S_n
 
Copy content magma:Order(Centralizer(SymmetricGroup(n), G));
 
Copy content sage:SymmetricGroup(8).centralizer(G).order()
 
Copy content oscar:order(centralizer(symmetric_group(8), G)[1])
 
Copy content gap:Order(Centralizer(SymmetricGroup(8), G));
 
Generators:  $(1,3)(2,8)(4,6)(5,7)$, $(1,8)(2,3)(4,5)(6,7)$, $(1,2,3)(4,6,5)$, $(1,5)(2,6)(3,7)(4,8)$
Copy content comment:Generators
 
Copy content magma:Generators(G);
 
Copy content sage:G.gens()
 
Copy content oscar:gens(G)
 
Copy content gap:GeneratorsOfGroup(G);
 

Low degree resolvents

$\card{(G/N)}$Galois groups for stem field(s)
$2$:  $C_2$
$3$:  $C_3$
$6$:  $C_6$
$12$:  $A_4$

Resolvents shown for degrees $\leq 47$

Subfields

Degree 2: $C_2$

Degree 4: $A_4$

Low degree siblings

6T6, 12T6, 12T7, 24T9

Siblings are shown with degree $\leq 47$

A number field with this Galois group has no arithmetically equivalent fields.

Conjugacy classes

LabelCycle TypeSizeOrderIndexRepresentative
1A $1^{8}$ $1$ $1$ $0$ $()$
2A $2^{4}$ $1$ $2$ $4$ $(1,6)(2,5)(3,4)(7,8)$
2B $2^{4}$ $3$ $2$ $4$ $(1,5)(2,6)(3,7)(4,8)$
2C $2^{4}$ $3$ $2$ $4$ $(1,3)(2,8)(4,6)(5,7)$
3A1 $3^{2},1^{2}$ $4$ $3$ $4$ $(2,8,3)(4,5,7)$
3A-1 $3^{2},1^{2}$ $4$ $3$ $4$ $(2,3,8)(4,7,5)$
6A1 $6,2$ $4$ $6$ $6$ $(1,6)(2,4,8,5,3,7)$
6A-1 $6,2$ $4$ $6$ $6$ $(1,4,8,6,3,7)(2,5)$

Malle's constant $a(G)$:     $1/4$

Copy content comment:Conjugacy classes
 
Copy content magma:ConjugacyClasses(G);
 
Copy content sage:G.conjugacy_classes()
 
Copy content oscar:conjugacy_classes(G)
 
Copy content gap:ConjugacyClasses(G);
 

Character table

1A 2A 2B 2C 3A1 3A-1 6A1 6A-1
Size 1 1 3 3 4 4 4 4
2 P 1A 1A 1A 1A 3A-1 3A1 3A1 3A-1
3 P 1A 2A 2B 2C 1A 1A 2A 2A
Type
24.13.1a R 1 1 1 1 1 1 1 1
24.13.1b R 1 −1 −1 1 1 1 −1 −1
24.13.1c1 C 1 1 1 1 ζ3−1 ζ3 ζ3 ζ3−1
24.13.1c2 C 1 1 1 1 ζ3 ζ3−1 ζ3−1 ζ3
24.13.1d1 C 1 −1 −1 1 ζ3−1 ζ3 −ζ3 −ζ3−1
24.13.1d2 C 1 −1 −1 1 ζ3 ζ3−1 −ζ3−1 −ζ3
24.13.3a R 3 3 −1 −1 0 0 0 0
24.13.3b R 3 −3 1 −1 0 0 0 0

Copy content comment:Character table
 
Copy content magma:CharacterTable(G);
 
Copy content sage:G.character_table()
 
Copy content oscar:character_table(G)
 
Copy content gap:CharacterTable(G);
 

Regular extensions

$f_{ 1 } =$ $x^{8} + 2 t x^{6} + \left(t^{2} + 18\right) x^{4} - 14 t x^{2} + 81$ Copy content Toggle raw display