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Properties

Label 28T7
Degree $28$
Order $56$
Cyclic no
Abelian no
Solvable yes
Primitive no
$p$-group no
Group: $C_7:D_4$

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Show commands: Magma

magma: G := TransitiveGroup(28, 7);
 

Group action invariants

Degree $n$:  $28$
magma: t, n := TransitiveGroupIdentification(G); n;
 
Transitive number $t$:  $7$
magma: t, n := TransitiveGroupIdentification(G); t;
 
Group:  $C_7:D_4$
Parity:  $-1$
magma: IsEven(G);
 
Primitive:  no
magma: IsPrimitive(G);
 
magma: NilpotencyClass(G);
 
$\card{\Aut(F/K)}$:  $2$
magma: Order(Centralizer(SymmetricGroup(n), G));
 
Generators:  (1,11,22,3,14,23,5,15,25,7,17,28,9,20)(2,12,21,4,13,24,6,16,26,8,18,27,10,19), (1,14)(2,13)(3,12)(4,11)(5,9)(6,10)(7,8)(15,27)(16,28)(17,25)(18,26)(19,23)(20,24)
magma: Generators(G);
 

Low degree resolvents

|G/N|Galois groups for stem field(s)
$2$:  $C_2$ x 3
$4$:  $C_2^2$
$8$:  $D_{4}$
$14$:  $D_{7}$
$28$:  $D_{14}$

Resolvents shown for degrees $\leq 47$

Subfields

Degree 2: $C_2$

Degree 4: $D_{4}$

Degree 7: $D_{7}$

Degree 14: $D_{14}$

Low degree siblings

28T6

Siblings are shown with degree $\leq 47$

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

Conjugacy classes

Cycle TypeSizeOrderRepresentative
$ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 $ $1$ $1$ $()$
$ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1 $ $14$ $2$ $( 3,27)( 4,28)( 5,25)( 6,26)( 7,24)( 8,23)( 9,22)(10,21)(11,19)(12,20)(13,18) (14,17)(15,16)$
$ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 $ $1$ $2$ $( 1, 2)( 3, 4)( 5, 6)( 7, 8)( 9,10)(11,12)(13,14)(15,16)(17,18)(19,20)(21,22) (23,24)(25,26)(27,28)$
$ 4, 4, 4, 4, 4, 4, 4 $ $14$ $4$ $( 1, 3, 2, 4)( 5,28, 6,27)( 7,26, 8,25)( 9,23,10,24)(11,21,12,22)(13,19,14,20) (15,18,16,17)$
$ 14, 14 $ $2$ $14$ $( 1, 3, 5, 7, 9,11,14,15,17,20,22,23,25,28)( 2, 4, 6, 8,10,12,13,16,18,19,21, 24,26,27)$
$ 14, 14 $ $2$ $14$ $( 1, 4, 5, 8, 9,12,14,16,17,19,22,24,25,27)( 2, 3, 6, 7,10,11,13,15,18,20,21, 23,26,28)$
$ 7, 7, 7, 7 $ $2$ $7$ $( 1, 5, 9,14,17,22,25)( 2, 6,10,13,18,21,26)( 3, 7,11,15,20,23,28) ( 4, 8,12,16,19,24,27)$
$ 14, 14 $ $2$ $14$ $( 1, 6, 9,13,17,21,25, 2, 5,10,14,18,22,26)( 3, 8,11,16,20,24,28, 4, 7,12,15, 19,23,27)$
$ 14, 14 $ $2$ $14$ $( 1, 7,14,20,25, 3, 9,15,22,28, 5,11,17,23)( 2, 8,13,19,26, 4,10,16,21,27, 6, 12,18,24)$
$ 14, 14 $ $2$ $14$ $( 1, 8,14,19,25, 4, 9,16,22,27, 5,12,17,24)( 2, 7,13,20,26, 3,10,15,21,28, 6, 11,18,23)$
$ 7, 7, 7, 7 $ $2$ $7$ $( 1, 9,17,25, 5,14,22)( 2,10,18,26, 6,13,21)( 3,11,20,28, 7,15,23) ( 4,12,19,27, 8,16,24)$
$ 14, 14 $ $2$ $14$ $( 1,10,17,26, 5,13,22, 2, 9,18,25, 6,14,21)( 3,12,20,27, 7,16,23, 4,11,19,28, 8,15,24)$
$ 14, 14 $ $2$ $14$ $( 1,11,22, 3,14,23, 5,15,25, 7,17,28, 9,20)( 2,12,21, 4,13,24, 6,16,26, 8,18, 27,10,19)$
$ 14, 14 $ $2$ $14$ $( 1,12,22, 4,14,24, 5,16,25, 8,17,27, 9,19)( 2,11,21, 3,13,23, 6,15,26, 7,18, 28,10,20)$
$ 14, 14 $ $2$ $14$ $( 1,13,25,10,22, 6,17, 2,14,26, 9,21, 5,18)( 3,16,28,12,23, 8,20, 4,15,27,11, 24, 7,19)$
$ 7, 7, 7, 7 $ $2$ $7$ $( 1,14,25, 9,22, 5,17)( 2,13,26,10,21, 6,18)( 3,15,28,11,23, 7,20) ( 4,16,27,12,24, 8,19)$
$ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 $ $2$ $2$ $( 1,15)( 2,16)( 3,17)( 4,18)( 5,20)( 6,19)( 7,22)( 8,21)( 9,23)(10,24)(11,25) (12,26)(13,27)(14,28)$

magma: ConjugacyClasses(G);
 

Group invariants

Order:  $56=2^{3} \cdot 7$
magma: Order(G);
 
Cyclic:  no
magma: IsCyclic(G);
 
Abelian:  no
magma: IsAbelian(G);
 
Solvable:  yes
magma: IsSolvable(G);
 
Nilpotency class:   not nilpotent
Label:  56.7
magma: IdentifyGroup(G);
 
Character table:    
      2  3  2  3  2   2   2  2   2   2   2  2   2   2   2   2  2  2
      7  1  .  1  .   1   1  1   1   1   1  1   1   1   1   1  1  1

        1a 2a 2b 4a 14a 14b 7a 14c 14d 14e 7b 14f 14g 14h 14i 7c 2c
     2P 1a 1a 1a 2b  7a  7a 7b  7b  7c  7c 7c  7c  7b  7b  7a 7a 1a
     3P 1a 2a 2b 4a 14d 14e 7c 14i 14h 14g 7a 14c 14a 14b 14f 7b 2c
     5P 1a 2a 2b 4a 14g 14h 7b 14f 14a 14b 7c 14i 14e 14d 14c 7a 2c
     7P 1a 2a 2b 4a  2c  2c 1a  2b  2c  2c 1a  2b  2c  2c  2b 1a 2c
    11P 1a 2a 2b 4a 14e 14d 7c 14i 14g 14h 7a 14c 14b 14a 14f 7b 2c
    13P 1a 2a 2b 4a 14b 14a 7a 14c 14e 14d 7b 14f 14h 14g 14i 7c 2c

X.1      1  1  1  1   1   1  1   1   1   1  1   1   1   1   1  1  1
X.2      1 -1  1 -1   1   1  1   1   1   1  1   1   1   1   1  1  1
X.3      1 -1  1  1  -1  -1  1   1  -1  -1  1   1  -1  -1   1  1 -1
X.4      1  1  1 -1  -1  -1  1   1  -1  -1  1   1  -1  -1   1  1 -1
X.5      2  . -2  .   .   .  2  -2   .   .  2  -2   .   .  -2  2  .
X.6      2  .  2  .   A   A -B  -B   C   C -C  -C   B   B  -A -A -2
X.7      2  .  2  .   B   B -C  -C   A   A -A  -A   C   C  -B -B -2
X.8      2  .  2  .   C   C -A  -A   B   B -B  -B   A   A  -C -C -2
X.9      2  .  2  .  -A  -A -B  -B  -C  -C -C  -C  -B  -B  -A -A  2
X.10     2  .  2  .  -B  -B -C  -C  -A  -A -A  -A  -C  -C  -B -B  2
X.11     2  .  2  .  -C  -C -A  -A  -B  -B -B  -B  -A  -A  -C -C  2
X.12     2  . -2  .   D  -D -C   C   F  -F -A   A  -E   E   B -B  .
X.13     2  . -2  .   E  -E -A   A  -D   D -B   B   F  -F   C -C  .
X.14     2  . -2  .   F  -F -B   B   E  -E -C   C   D  -D   A -A  .
X.15     2  . -2  .  -F   F -B   B  -E   E -C   C  -D   D   A -A  .
X.16     2  . -2  .  -E   E -A   A   D  -D -B   B  -F   F   C -C  .
X.17     2  . -2  .  -D   D -C   C  -F   F -A   A   E  -E   B -B  .

A = -E(7)^3-E(7)^4
B = -E(7)-E(7)^6
C = -E(7)^2-E(7)^5
D = -E(7)+E(7)^6
E = -E(7)^2+E(7)^5
F = -E(7)^3+E(7)^4

magma: CharacterTable(G);