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Properties

Label 20T1
Degree $20$
Order $20$
Cyclic yes
Abelian yes
Solvable yes
Primitive no
$p$-group no
Group: $C_{20}$

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Show commands: Magma

magma: G := TransitiveGroup(20, 1);
 

Group action invariants

Degree $n$:  $20$
magma: t, n := TransitiveGroupIdentification(G); n;
 
Transitive number $t$:  $1$
magma: t, n := TransitiveGroupIdentification(G); t;
 
Group:  $C_{20}$
Parity:  $-1$
magma: IsEven(G);
 
Primitive:  no
magma: IsPrimitive(G);
 
magma: NilpotencyClass(G);
 
$\card{\Aut(F/K)}$:  $20$
magma: Order(Centralizer(SymmetricGroup(n), G));
 
Generators:  (1,12,2,11)(3,14,4,13)(5,15,6,16)(7,17,8,18)(9,20,10,19), (1,4,6,8,9,12,13,16,18,20,2,3,5,7,10,11,14,15,17,19)
magma: Generators(G);
 

Low degree resolvents

$\card{(G/N)}$Galois groups for stem field(s)
$2$:  $C_2$
$4$:  $C_4$
$5$:  $C_5$
$10$:  $C_{10}$

Resolvents shown for degrees $\leq 47$

Subfields

Degree 2: $C_2$

Degree 4: $C_4$

Degree 5: $C_5$

Degree 10: $C_{10}$

Low degree siblings

There are no siblings with degree $\leq 47$
A number field with this Galois group has no arithmetically equivalent fields.

Conjugacy classes

LabelCycle TypeSizeOrderIndexRepresentative
1A $1^{20}$ $1$ $1$ $0$ $()$
2A $2^{10}$ $1$ $2$ $10$ $( 1, 2)( 3, 4)( 5, 6)( 7, 8)( 9,10)(11,12)(13,14)(15,16)(17,18)(19,20)$
4A1 $4^{5}$ $1$ $4$ $15$ $( 1,12, 2,11)( 3,14, 4,13)( 5,15, 6,16)( 7,17, 8,18)( 9,20,10,19)$
4A-1 $4^{5}$ $1$ $4$ $15$ $( 1,11, 2,12)( 3,13, 4,14)( 5,16, 6,15)( 7,18, 8,17)( 9,19,10,20)$
5A1 $5^{4}$ $1$ $5$ $16$ $( 1,14, 5,18, 9)( 2,13, 6,17,10)( 3,16, 8,19,11)( 4,15, 7,20,12)$
5A-1 $5^{4}$ $1$ $5$ $16$ $( 1, 9,18, 5,14)( 2,10,17, 6,13)( 3,11,19, 8,16)( 4,12,20, 7,15)$
5A2 $5^{4}$ $1$ $5$ $16$ $( 1, 5, 9,14,18)( 2, 6,10,13,17)( 3, 8,11,16,19)( 4, 7,12,15,20)$
5A-2 $5^{4}$ $1$ $5$ $16$ $( 1,18,14, 9, 5)( 2,17,13,10, 6)( 3,19,16,11, 8)( 4,20,15,12, 7)$
10A1 $10^{2}$ $1$ $10$ $18$ $( 1,17,14,10, 5, 2,18,13, 9, 6)( 3,20,16,12, 8, 4,19,15,11, 7)$
10A-1 $10^{2}$ $1$ $10$ $18$ $( 1, 6, 9,13,18, 2, 5,10,14,17)( 3, 7,11,15,19, 4, 8,12,16,20)$
10A3 $10^{2}$ $1$ $10$ $18$ $( 1,10,18, 6,14, 2, 9,17, 5,13)( 3,12,19, 7,16, 4,11,20, 8,15)$
10A-3 $10^{2}$ $1$ $10$ $18$ $( 1,13, 5,17, 9, 2,14, 6,18,10)( 3,15, 8,20,11, 4,16, 7,19,12)$
20A1 $20$ $1$ $20$ $19$ $( 1,15,10, 3,18,12, 6,19,14, 7, 2,16, 9, 4,17,11, 5,20,13, 8)$
20A-1 $20$ $1$ $20$ $19$ $( 1,19,17,15,14,11,10, 7, 5, 3, 2,20,18,16,13,12, 9, 8, 6, 4)$
20A3 $20$ $1$ $20$ $19$ $( 1,16,10, 4,18,11, 6,20,14, 8, 2,15, 9, 3,17,12, 5,19,13, 7)$
20A-3 $20$ $1$ $20$ $19$ $( 1, 7,13,19, 5,12,17, 3, 9,15, 2, 8,14,20, 6,11,18, 4,10,16)$
20A7 $20$ $1$ $20$ $19$ $( 1, 8,13,20, 5,11,17, 4, 9,16, 2, 7,14,19, 6,12,18, 3,10,15)$
20A-7 $20$ $1$ $20$ $19$ $( 1, 4, 6, 8, 9,12,13,16,18,20, 2, 3, 5, 7,10,11,14,15,17,19)$
20A9 $20$ $1$ $20$ $19$ $( 1, 3, 6, 7, 9,11,13,15,18,19, 2, 4, 5, 8,10,12,14,16,17,20)$
20A-9 $20$ $1$ $20$ $19$ $( 1,20,17,16,14,12,10, 8, 5, 4, 2,19,18,15,13,11, 9, 7, 6, 3)$

Malle's constant $a(G)$:     $1/10$

magma: ConjugacyClasses(G);
 

Group invariants

Order:  $20=2^{2} \cdot 5$
magma: Order(G);
 
Cyclic:  yes
magma: IsCyclic(G);
 
Abelian:  yes
magma: IsAbelian(G);
 
Solvable:  yes
magma: IsSolvable(G);
 
Nilpotency class:  $1$
Label:  20.2
magma: IdentifyGroup(G);
 
Character table:

1A 2A 4A1 4A-1 5A1 5A-1 5A2 5A-2 10A1 10A-1 10A3 10A-3 20A1 20A-1 20A3 20A-3 20A7 20A-7 20A9 20A-9
Size 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
2 P 1A 1A 2A 2A 5A2 5A-2 5A-1 5A1 5A1 5A-1 5A-2 5A2 10A3 10A1 10A3 10A-3 10A-3 10A-1 10A-1 10A1
5 P 1A 2A 4A1 4A-1 1A 1A 1A 1A 2A 2A 2A 2A 4A1 4A-1 4A-1 4A1 4A-1 4A1 4A-1 4A1
Type
20.2.1a R 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
20.2.1b R 1 1 −1 −1 1 1 1 1 1 1 1 1 −1 −1 −1 −1 −1 −1 −1 −1
20.2.1c1 C 1 −1 −i i 1 1 1 1 −1 −1 −1 −1 −i i i −i i −i −i i
20.2.1c2 C 1 −1 i −i 1 1 1 1 −1 −1 −1 −1 i −i −i i −i i i −i
20.2.1d1 C 1 1 1 1 ζ5−2 ζ52 ζ5 ζ5−1 ζ5−1 ζ5 ζ52 ζ5−2 ζ52 ζ5−2 ζ5 ζ5−1 ζ5−1 ζ5 ζ5−2 ζ52
20.2.1d2 C 1 1 1 1 ζ52 ζ5−2 ζ5−1 ζ5 ζ5 ζ5−1 ζ5−2 ζ52 ζ5−2 ζ52 ζ5−1 ζ5 ζ5 ζ5−1 ζ52 ζ5−2
20.2.1d3 C 1 1 1 1 ζ5−1 ζ5 ζ5−2 ζ52 ζ52 ζ5−2 ζ5 ζ5−1 ζ5 ζ5−1 ζ5−2 ζ52 ζ52 ζ5−2 ζ5−1 ζ5
20.2.1d4 C 1 1 1 1 ζ5 ζ5−1 ζ52 ζ5−2 ζ5−2 ζ52 ζ5−1 ζ5 ζ5−1 ζ5 ζ52 ζ5−2 ζ5−2 ζ52 ζ5 ζ5−1
20.2.1e1 C 1 1 −1 −1 ζ5−2 ζ52 ζ5 ζ5−1 ζ5−1 ζ5 ζ52 ζ5−2 −ζ52 −ζ5−2 −ζ5 −ζ5−1 −ζ5−1 −ζ5 −ζ5−2 −ζ52
20.2.1e2 C 1 1 −1 −1 ζ52 ζ5−2 ζ5−1 ζ5 ζ5 ζ5−1 ζ5−2 ζ52 −ζ5−2 −ζ52 −ζ5−1 −ζ5 −ζ5 −ζ5−1 −ζ52 −ζ5−2
20.2.1e3 C 1 1 −1 −1 ζ5−1 ζ5 ζ5−2 ζ52 ζ52 ζ5−2 ζ5 ζ5−1 −ζ5 −ζ5−1 −ζ5−2 −ζ52 −ζ52 −ζ5−2 −ζ5−1 −ζ5
20.2.1e4 C 1 1 −1 −1 ζ5 ζ5−1 ζ52 ζ5−2 ζ5−2 ζ52 ζ5−1 ζ5 −ζ5−1 −ζ5 −ζ52 −ζ5−2 −ζ5−2 −ζ52 −ζ5 −ζ5−1
20.2.1f1 C 1 −1 −ζ205 ζ205 −ζ202 ζ208 ζ204 −ζ206 ζ206 −ζ204 −ζ208 ζ202 ζ203 −ζ207 ζ209 −ζ20 ζ20 −ζ209 ζ207 −ζ203
20.2.1f2 C 1 −1 ζ205 −ζ205 ζ208 −ζ202 −ζ206 ζ204 −ζ204 ζ206 ζ202 −ζ208 −ζ207 ζ203 −ζ20 ζ209 −ζ209 ζ20 −ζ203 ζ207
20.2.1f3 C 1 −1 −ζ205 ζ205 ζ208 −ζ202 −ζ206 ζ204 −ζ204 ζ206 ζ202 −ζ208 ζ207 −ζ203 ζ20 −ζ209 ζ209 −ζ20 ζ203 −ζ207
20.2.1f4 C 1 −1 ζ205 −ζ205 −ζ202 ζ208 ζ204 −ζ206 ζ206 −ζ204 −ζ208 ζ202 −ζ203 ζ207 −ζ209 ζ20 −ζ20 ζ209 −ζ207 ζ203
20.2.1f5 C 1 −1 −ζ205 ζ205 −ζ206 ζ204 −ζ202 ζ208 −ζ208 ζ202 −ζ204 ζ206 −ζ209 ζ20 −ζ207 ζ203 −ζ203 ζ207 −ζ20 ζ209
20.2.1f6 C 1 −1 ζ205 −ζ205 ζ204 −ζ206 ζ208 −ζ202 ζ202 −ζ208 ζ206 −ζ204 ζ20 −ζ209 ζ203 −ζ207 ζ207 −ζ203 ζ209 −ζ20
20.2.1f7 C 1 −1 −ζ205 ζ205 ζ204 −ζ206 ζ208 −ζ202 ζ202 −ζ208 ζ206 −ζ204 −ζ20 ζ209 −ζ203 ζ207 −ζ207 ζ203 −ζ209 ζ20
20.2.1f8 C 1 −1 ζ205 −ζ205 −ζ206 ζ204 −ζ202 ζ208 −ζ208 ζ202 −ζ204 ζ206 ζ209 −ζ20 ζ207 −ζ203 ζ203 −ζ207 ζ20 −ζ209

magma: CharacterTable(G);