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Properties

Label 40T36
Degree $40$
Order $80$
Cyclic no
Abelian no
Solvable yes
Primitive no
$p$-group no
Group: $D_{20}:C_2$

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Show commands: Magma

magma: G := TransitiveGroup(40, 36);
 

Group action invariants

Degree $n$:  $40$
magma: t, n := TransitiveGroupIdentification(G); n;
 
Transitive number $t$:  $36$
magma: t, n := TransitiveGroupIdentification(G); t;
 
Group:  $D_{20}:C_2$
Parity:  $1$
magma: IsEven(G);
 
Primitive:  no
magma: IsPrimitive(G);
 
magma: NilpotencyClass(G);
 
$\card{\Aut(F/K)}$:  $4$
magma: Order(Centralizer(SymmetricGroup(n), G));
 
Generators:  (1,14,2,13)(3,15,4,16)(5,12,6,11)(7,9,8,10)(17,40,18,39)(19,38,20,37)(21,35,22,36)(23,34,24,33)(25,30,26,29)(27,32,28,31), (1,9,19,27,36,3,11,18,26,33,2,10,20,28,35,4,12,17,25,34)(5,16,21,31,38,7,14,23,30,39,6,15,22,32,37,8,13,24,29,40), (1,6,11,13,20,21,25,30,36,37,2,5,12,14,19,22,26,29,35,38)(3,7,10,15,17,24,27,31,33,39,4,8,9,16,18,23,28,32,34,40)
magma: Generators(G);
 

Low degree resolvents

|G/N|Galois groups for stem field(s)
$2$:  $C_2$ x 7
$4$:  $C_2^2$ x 7
$8$:  $C_2^3$
$10$:  $D_{5}$
$16$:  $Q_8:C_2$
$20$:  $D_{10}$ x 3
$40$:  20T8

Resolvents shown for degrees $\leq 47$

Subfields

Degree 2: $C_2$ x 3

Degree 4: $C_2^2$

Degree 5: $D_{5}$

Degree 8: $Q_8:C_2$

Degree 10: $D_{10}$ x 3

Degree 20: 20T8

Low degree siblings

40T36 x 2

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, 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, 2, 2, 2, 2, 2, 1, 1, 1, 1 $ $10$ $2$ $( 3, 4)( 5,38)( 6,37)( 7,40)( 8,39)( 9,34)(10,33)(11,35)(12,36)(13,30)(14,29) (15,32)(16,31)(17,27)(18,28)(19,25)(20,26)(23,24)$
$ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 $ $1$ $2$ $( 1, 2)( 3, 4)( 5, 6)( 7, 8)( 9,10)(11,12)(13,14)(15,16)(17,18)(19,20)(21,22) (23,24)(25,26)(27,28)(29,30)(31,32)(33,34)(35,36)(37,38)(39,40)$
$ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 $ $10$ $2$ $( 1, 3)( 2, 4)( 5,39)( 6,40)( 7,38)( 8,37)( 9,36)(10,35)(11,34)(12,33)(13,32) (14,31)(15,29)(16,30)(17,26)(18,25)(19,27)(20,28)(21,23)(22,24)$
$ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 $ $2$ $4$ $( 1, 3, 2, 4)( 5, 7, 6, 8)( 9,11,10,12)(13,16,14,15)(17,19,18,20)(21,23,22,24) (25,27,26,28)(29,31,30,32)(33,35,34,36)(37,40,38,39)$
$ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 $ $5$ $4$ $( 1, 5, 2, 6)( 3, 7, 4, 8)( 9,39,10,40)(11,37,12,38)(13,35,14,36)(15,33,16,34) (17,32,18,31)(19,29,20,30)(21,26,22,25)(23,28,24,27)$
$ 20, 20 $ $4$ $20$ $( 1, 5,11,14,20,22,25,29,36,38, 2, 6,12,13,19,21,26,30,35,37)( 3, 8,10,16,17, 23,27,32,33,40, 4, 7, 9,15,18,24,28,31,34,39)$
$ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 $ $5$ $4$ $( 1, 6, 2, 5)( 3, 8, 4, 7)( 9,40,10,39)(11,38,12,37)(13,36,14,35)(15,34,16,33) (17,31,18,32)(19,30,20,29)(21,25,22,26)(23,27,24,28)$
$ 20, 20 $ $4$ $20$ $( 1, 7,11,15,20,24,25,31,36,39, 2, 8,12,16,19,23,26,32,35,40)( 3, 5,10,14,17, 22,27,29,33,38, 4, 6, 9,13,18,21,28,30,34,37)$
$ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 $ $10$ $2$ $( 1, 7)( 2, 8)( 3, 6)( 4, 5)( 9,37)(10,38)(11,40)(12,39)(13,34)(14,33)(15,35) (16,36)(17,29)(18,30)(19,31)(20,32)(21,28)(22,27)(23,25)(24,26)$
$ 20, 20 $ $4$ $20$ $( 1, 9,19,27,36, 3,11,18,26,33, 2,10,20,28,35, 4,12,17,25,34)( 5,16,21,31,38, 7,14,23,30,39, 6,15,22,32,37, 8,13,24,29,40)$
$ 10, 10, 10, 10 $ $2$ $10$ $( 1,11,20,25,36, 2,12,19,26,35)( 3,10,17,27,33, 4, 9,18,28,34)( 5,14,22,29,38, 6,13,21,30,37)( 7,15,24,31,39, 8,16,23,32,40)$
$ 5, 5, 5, 5, 5, 5, 5, 5 $ $2$ $5$ $( 1,12,20,26,36)( 2,11,19,25,35)( 3, 9,17,28,33)( 4,10,18,27,34) ( 5,13,22,30,38)( 6,14,21,29,37)( 7,16,24,32,39)( 8,15,23,31,40)$
$ 20, 20 $ $4$ $20$ $( 1,13,25,37,12,22,35, 6,20,30, 2,14,26,38,11,21,36, 5,19,29)( 3,15,27,39, 9, 23,34, 7,17,31, 4,16,28,40,10,24,33, 8,18,32)$
$ 20, 20 $ $4$ $20$ $( 1,15,25,39,12,23,35, 7,20,31, 2,16,26,40,11,24,36, 8,19,32)( 3,14,27,38, 9, 21,34, 5,17,29, 4,13,28,37,10,22,33, 6,18,30)$
$ 20, 20 $ $4$ $20$ $( 1,17,35,10,26, 3,19,34,12,28, 2,18,36, 9,25, 4,20,33,11,27)( 5,24,37,15,30, 7,21,40,13,32, 6,23,38,16,29, 8,22,39,14,31)$
$ 10, 10, 10, 10 $ $2$ $10$ $( 1,19,36,11,26, 2,20,35,12,25)( 3,18,33,10,28, 4,17,34, 9,27)( 5,21,38,14,30, 6,22,37,13,29)( 7,23,39,15,32, 8,24,40,16,31)$
$ 5, 5, 5, 5, 5, 5, 5, 5 $ $2$ $5$ $( 1,20,36,12,26)( 2,19,35,11,25)( 3,17,33, 9,28)( 4,18,34,10,27) ( 5,22,38,13,30)( 6,21,37,14,29)( 7,24,39,16,32)( 8,23,40,15,31)$
$ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 $ $2$ $4$ $( 1,21, 2,22)( 3,24, 4,23)( 5,26, 6,25)( 7,27, 8,28)( 9,32,10,31)(11,30,12,29) (13,36,14,35)(15,33,16,34)(17,39,18,40)(19,38,20,37)$
$ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 $ $2$ $4$ $( 1,23, 2,24)( 3,21, 4,22)( 5,28, 6,27)( 7,26, 8,25)( 9,29,10,30)(11,32,12,31) (13,33,14,34)(15,35,16,36)(17,37,18,38)(19,39,20,40)$

magma: ConjugacyClasses(G);
 

Group invariants

Order:  $80=2^{4} \cdot 5$
magma: Order(G);
 
Cyclic:  no
magma: IsCyclic(G);
 
Abelian:  no
magma: IsAbelian(G);
 
Solvable:  yes
magma: IsSolvable(G);
 
Nilpotency class:   not nilpotent
Label:  80.42
magma: IdentifyGroup(G);
 
Character table:    
      2  4  3  4  3  3  4   2  4   2  3   2   3   3   2   2   2   3   3  3  3
      5  1  .  1  .  1  .   1  .   1  .   1   1   1   1   1   1   1   1  1  1

        1a 2a 2b 2c 4a 4b 20a 4c 20b 2d 20c 10a  5a 20d 20e 20f 10b  5b 4d 4e
     2P 1a 1a 1a 1a 2b 2b 10a 2b 10a 1a 10b  5b  5b 10b 10b 10a  5a  5a 2b 2b
     3P 1a 2a 2b 2c 4a 4c 20d 4b 20e 2d 20f 10b  5b 20a 20b 20c 10a  5a 4d 4e
     5P 1a 2a 2b 2c 4a 4b  4d 4c  4e 2d  4a  2b  1a  4d  4e  4a  2b  1a 4d 4e
     7P 1a 2a 2b 2c 4a 4c 20d 4b 20e 2d 20f 10b  5b 20a 20b 20c 10a  5a 4d 4e
    11P 1a 2a 2b 2c 4a 4c 20a 4b 20b 2d 20c 10a  5a 20d 20e 20f 10b  5b 4d 4e
    13P 1a 2a 2b 2c 4a 4b 20d 4c 20e 2d 20f 10b  5b 20a 20b 20c 10a  5a 4d 4e
    17P 1a 2a 2b 2c 4a 4b 20d 4c 20e 2d 20f 10b  5b 20a 20b 20c 10a  5a 4d 4e
    19P 1a 2a 2b 2c 4a 4c 20a 4b 20b 2d 20c 10a  5a 20d 20e 20f 10b  5b 4d 4e

X.1      1  1  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   1  1  1
X.3      1 -1  1 -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   1  1 -1
X.5      1 -1  1  1 -1  1  -1  1   1 -1  -1   1   1  -1   1  -1   1   1 -1  1
X.6      1  1  1 -1 -1 -1  -1 -1   1  1  -1   1   1  -1   1  -1   1   1 -1  1
X.7      1  1  1 -1 -1  1   1  1  -1 -1  -1   1   1   1  -1  -1   1   1  1 -1
X.8      1  1  1  1  1 -1  -1 -1  -1 -1   1   1   1  -1  -1   1   1   1 -1 -1
X.9      2  . -2  .  .  A   . -A   .  .   .  -2   2   .   .   .  -2   2  .  .
X.10     2  . -2  .  . -A   .  A   .  .   .  -2   2   .   .   .  -2   2  .  .
X.11     2  .  2  . -2  .   B  .  -B  .  *B -*B -*B  *B -*B   B  -B  -B -2  2
X.12     2  .  2  . -2  .  *B  . -*B  .   B  -B  -B   B  -B  *B -*B -*B -2  2
X.13     2  .  2  . -2  . -*B  .  *B  .   B  -B  -B  -B   B  *B -*B -*B  2 -2
X.14     2  .  2  . -2  .  -B  .   B  .  *B -*B -*B -*B  *B   B  -B  -B  2 -2
X.15     2  .  2  .  2  .   B  .   B  . -*B -*B -*B  *B  *B  -B  -B  -B -2 -2
X.16     2  .  2  .  2  .  *B  .  *B  .  -B  -B  -B   B   B -*B -*B -*B -2 -2
X.17     2  .  2  .  2  . -*B  . -*B  .  -B  -B  -B  -B  -B -*B -*B -*B  2  2
X.18     2  .  2  .  2  .  -B  .  -B  . -*B -*B -*B -*B -*B  -B  -B  -B  2  2
X.19     4  . -4  .  .  .   .  .   .  .   .   C  -C   .   .   .  *C -*C  .  .
X.20     4  . -4  .  .  .   .  .   .  .   .  *C -*C   .   .   .   C  -C  .  .

A = -2*E(4)
  = -2*Sqrt(-1) = -2i
B = -E(5)-E(5)^4
  = (1-Sqrt(5))/2 = -b5
C = -2*E(5)^2-2*E(5)^3
  = 1+Sqrt(5) = 1+r5

magma: CharacterTable(G);