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Magma
magma: G := TransitiveGroup(21, 49);
Group invariants
Abstract group: | $C_7^3:C_9:C_3$ | magma: IdentifyGroup(G);
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Order: | $9261=3^{3} \cdot 7^{3}$ | magma: Order(G);
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Cyclic: | no | magma: IsCyclic(G);
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Abelian: | no | magma: IsAbelian(G);
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Solvable: | yes | magma: IsSolvable(G);
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Nilpotency class: | not nilpotent | magma: NilpotencyClass(G);
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Group action invariants
Degree $n$: | $21$ | magma: t, n := TransitiveGroupIdentification(G); n;
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Transitive number $t$: | $49$ | magma: t, n := TransitiveGroupIdentification(G); t;
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Parity: | $1$ | magma: IsEven(G);
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Primitive: | no | magma: IsPrimitive(G);
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$\card{\Aut(F/K)}$: | $1$ | magma: Order(Centralizer(SymmetricGroup(n), G));
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Generators: | $(1,11,17)(2,12,15,3,13,20,5,8,16)(4,14,18,7,10,19,6,9,21)$, $(1,7,3)(2,4,5)(8,11,14,10,13,9,12)(15,16,18)(17,20,19)$ | magma: Generators(G);
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Low degree resolvents
$\card{(G/N)}$ Galois groups for stem field(s) $3$: $C_3$ x 4 $9$: $C_3^2$ $27$: $C_9:C_3$ Resolvents shown for degrees $\leq 47$
Subfields
Degree 3: $C_3$
Degree 7: None
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
Label | Cycle Type | Size | Order | Index | Representative |
1A | $1^{21}$ | $1$ | $1$ | $0$ | $()$ |
3A1 | $3^{4},1^{9}$ | $147$ | $3$ | $8$ | $( 1, 6, 2)( 4, 5, 7)(15,17,18)(16,21,20)$ |
3A-1 | $3^{4},1^{9}$ | $147$ | $3$ | $8$ | $( 1, 2, 6)( 4, 7, 5)(15,18,17)(16,20,21)$ |
3B1 | $3^{6},1^{3}$ | $343$ | $3$ | $12$ | $( 1, 2, 6)( 4, 7, 5)( 8,11, 9)(10,12,13)(15,21,17)(16,18,19)$ |
3B-1 | $3^{6},1^{3}$ | $343$ | $3$ | $12$ | $( 1, 6, 2)( 4, 5, 7)( 8, 9,11)(10,13,12)(15,17,21)(16,19,18)$ |
7A1 | $7,1^{14}$ | $9$ | $7$ | $6$ | $( 8,12, 9,13,10,14,11)$ |
7A-1 | $7,1^{14}$ | $9$ | $7$ | $6$ | $( 8,11,14,10,13, 9,12)$ |
7B1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 4, 7, 3, 6, 2, 5)( 8,12, 9,13,10,14,11)(15,18,21,17,20,16,19)$ |
7B-1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 3, 5, 7, 2, 4, 6)( 8,13,11, 9,14,12,10)(15,17,19,21,16,18,20)$ |
7C1 | $7^{2},1^{7}$ | $27$ | $7$ | $12$ | $( 8,12, 9,13,10,14,11)(15,18,21,17,20,16,19)$ |
7C-1 | $7^{2},1^{7}$ | $27$ | $7$ | $12$ | $( 8,13,11, 9,14,12,10)(15,17,19,21,16,18,20)$ |
7D1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 4, 7, 3, 6, 2, 5)( 8,14,13,12,11,10, 9)(15,18,21,17,20,16,19)$ |
7D-1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 4, 7, 3, 6, 2, 5)( 8, 9,10,11,12,13,14)(15,21,20,19,18,17,16)$ |
7E1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 5, 2, 6, 3, 7, 4)( 8,12, 9,13,10,14,11)(15,18,21,17,20,16,19)$ |
7E-1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 7, 6, 5, 4, 3, 2)( 8,13,11, 9,14,12,10)(15,17,19,21,16,18,20)$ |
7F1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 4, 7, 3, 6, 2, 5)( 8, 9,10,11,12,13,14)(15,18,21,17,20,16,19)$ |
7F-1 | $7^{3}$ | $27$ | $7$ | $18$ | $( 1, 4, 7, 3, 6, 2, 5)( 8,11,14,10,13, 9,12)(15,18,21,17,20,16,19)$ |
7G1 | $7^{2},1^{7}$ | $27$ | $7$ | $12$ | $( 1, 6, 4, 2, 7, 5, 3)( 8,10,12,14, 9,11,13)$ |
7G-1 | $7^{2},1^{7}$ | $27$ | $7$ | $12$ | $( 1, 5, 2, 6, 3, 7, 4)( 8,14,13,12,11,10, 9)$ |
9A1 | $9^{2},3$ | $1029$ | $9$ | $18$ | $( 1,17,10, 2,15,12, 6,21,13)( 3,20,14)( 4,18, 9, 7,19, 8, 5,16,11)$ |
9A-1 | $9^{2},3$ | $1029$ | $9$ | $18$ | $( 1,13,21, 6,12,15, 2,10,17)( 3,14,20)( 4,11,16, 5, 8,19, 7, 9,18)$ |
9B1 | $9^{2},3$ | $1029$ | $9$ | $18$ | $( 1,14,16, 5, 9,15, 6,13,20)( 2,11,21, 7,10,18, 3, 8,19)( 4,12,17)$ |
9B-1 | $9^{2},3$ | $1029$ | $9$ | $18$ | $( 1,20,13, 6,15, 9, 5,16,14)( 2,19, 8, 3,18,10, 7,21,11)( 4,17,12)$ |
9C1 | $9^{2},3$ | $1029$ | $9$ | $18$ | $( 1,13,21, 2, 8,19, 4,12,15)( 3,10,17, 6, 9,18, 5,14,20)( 7,11,16)$ |
9C-1 | $9^{2},3$ | $1029$ | $9$ | $18$ | $( 1,15,12, 4,19, 8, 2,21,13)( 3,20,14, 5,18, 9, 6,17,10)( 7,16,11)$ |
21A1 | $7,3^{4},1^{2}$ | $441$ | $21$ | $14$ | $( 1, 6, 2)( 4, 5, 7)( 8,14,13,12,11,10, 9)(15,17,18)(16,21,20)$ |
21A-1 | $7,3^{4},1^{2}$ | $441$ | $21$ | $14$ | $( 1, 2, 6)( 4, 7, 5)( 8, 9,10,11,12,13,14)(15,18,17)(16,20,21)$ |
21A2 | $7,3^{4},1^{2}$ | $441$ | $21$ | $14$ | $( 1, 2, 6)( 4, 7, 5)( 8,13,11, 9,14,12,10)(15,18,17)(16,20,21)$ |
21A-2 | $7,3^{4},1^{2}$ | $441$ | $21$ | $14$ | $( 1, 6, 2)( 4, 5, 7)( 8,10,12,14, 9,11,13)(15,17,18)(16,21,20)$ |
Malle's constant $a(G)$: $1/6$
magma: ConjugacyClasses(G);
Character table
1A | 3A1 | 3A-1 | 3B1 | 3B-1 | 7A1 | 7A-1 | 7B1 | 7B-1 | 7C1 | 7C-1 | 7D1 | 7D-1 | 7E1 | 7E-1 | 7F1 | 7F-1 | 7G1 | 7G-1 | 9A1 | 9A-1 | 9B1 | 9B-1 | 9C1 | 9C-1 | 21A1 | 21A-1 | 21A2 | 21A-2 | ||
Size | 1 | 147 | 147 | 343 | 343 | 9 | 9 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 1029 | 1029 | 1029 | 1029 | 1029 | 1029 | 441 | 441 | 441 | 441 | |
3 P | 1A | 3A-1 | 3A1 | 3B-1 | 3B1 | 7A1 | 7A-1 | 7B1 | 7B-1 | 7C1 | 7C-1 | 7D1 | 7D-1 | 7E1 | 7E-1 | 7F1 | 7F-1 | 7G1 | 7G-1 | 9A-1 | 9A1 | 9B-1 | 9B1 | 9C-1 | 9C1 | 21A2 | 21A-2 | 21A1 | 21A-1 | |
7 P | 1A | 1A | 1A | 1A | 1A | 7A-1 | 7A1 | 7B-1 | 7B1 | 7C-1 | 7C1 | 7D-1 | 7D1 | 7E-1 | 7E1 | 7F-1 | 7F1 | 7G-1 | 7G1 | 3B1 | 3B-1 | 3B-1 | 3B1 | 3B-1 | 3B1 | 7A1 | 7A-1 | 7A1 | 7A-1 | |
Type | ||||||||||||||||||||||||||||||
9261.f.1a | R | |||||||||||||||||||||||||||||
9261.f.1b1 | C | |||||||||||||||||||||||||||||
9261.f.1b2 | C | |||||||||||||||||||||||||||||
9261.f.1c1 | C | |||||||||||||||||||||||||||||
9261.f.1c2 | C | |||||||||||||||||||||||||||||
9261.f.1d1 | C | |||||||||||||||||||||||||||||
9261.f.1d2 | C | |||||||||||||||||||||||||||||
9261.f.1e1 | C | |||||||||||||||||||||||||||||
9261.f.1e2 | C | |||||||||||||||||||||||||||||
9261.f.3a1 | C | |||||||||||||||||||||||||||||
9261.f.3a2 | C | |||||||||||||||||||||||||||||
9261.f.9a1 | C | |||||||||||||||||||||||||||||
9261.f.9a2 | C | |||||||||||||||||||||||||||||
9261.f.9b1 | C | |||||||||||||||||||||||||||||
9261.f.9b2 | C | |||||||||||||||||||||||||||||
9261.f.9b3 | C | |||||||||||||||||||||||||||||
9261.f.9b4 | C | |||||||||||||||||||||||||||||
9261.f.27a1 | C | |||||||||||||||||||||||||||||
9261.f.27a2 | C | |||||||||||||||||||||||||||||
9261.f.27b1 | C | |||||||||||||||||||||||||||||
9261.f.27b2 | C | |||||||||||||||||||||||||||||
9261.f.27c1 | C | |||||||||||||||||||||||||||||
9261.f.27c2 | C | |||||||||||||||||||||||||||||
9261.f.27d1 | C | |||||||||||||||||||||||||||||
9261.f.27d2 | C | |||||||||||||||||||||||||||||
9261.f.27e1 | C | |||||||||||||||||||||||||||||
9261.f.27e2 | C | |||||||||||||||||||||||||||||
9261.f.27f1 | C | |||||||||||||||||||||||||||||
9261.f.27f2 | C |
magma: CharacterTable(G);
Regular extensions
Data not computed