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Properties

Label 304.20
Order \( 2^{4} \cdot 19 \)
Exponent \( 2^{2} \cdot 19 \)
Nilpotent yes
Solvable yes
$\card{G^{\mathrm{ab}}}$ \( 2^{3} \cdot 19 \)
$\card{Z(G)}$ \( 2^{2} \cdot 19 \)
$\card{\Aut(G)}$ \( 2^{6} \cdot 3^{2} \)
$\card{\mathrm{Out}(G)}$ \( 2^{4} \cdot 3^{2} \)
Perm deg. $27$
Trans deg. $152$
Rank $2$

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Show commands: Gap / Magma / SageMath

Copy content magma:G := SmallGroup(304, 20);
 
Copy content gap:G := SmallGroup(304, 20);
 
Copy content sage_gap:G = libgap.SmallGroup(304, 20)
 
Copy content comment:Define the group as a permutation group
 
Copy content sage:G = PermutationGroup(['(1,6,2,5)(3,8,4,7)', '(1,2)(3,4)(5,8)(6,7)', '(9,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10)', '(1,3)(2,4)(5,7)(6,8)', '(1,2)(3,4)(5,6)(7,8)'])
 

Group information

Description:$C_2^2:C_{76}$
Order: \(304\)\(\medspace = 2^{4} \cdot 19 \)
Copy content comment:Order of the group
 
Copy content magma:Order(G);
 
Copy content gap:Order(G);
 
Copy content sage:G.order()
 
Copy content sage_gap:G.Order()
 
Exponent: \(76\)\(\medspace = 2^{2} \cdot 19 \)
Copy content comment:Exponent of the group
 
Copy content magma:Exponent(G);
 
Copy content gap:Exponent(G);
 
Copy content sage:G.exponent()
 
Copy content sage_gap:G.Exponent()
 
Automorphism group:$C_2^5:C_{18}$, of order \(576\)\(\medspace = 2^{6} \cdot 3^{2} \)
Copy content comment:Automorphism group
 
Copy content gap:AutomorphismGroup(G);
 
Copy content magma:AutomorphismGroup(G);
 
Copy content sage_gap:G.AutomorphismGroup()
 
Composition factors:$C_2$ x 4, $C_{19}$
Copy content comment:Composition factors of the group
 
Copy content magma:CompositionFactors(G);
 
Copy content gap:CompositionSeries(G);
 
Copy content sage:G.composition_series()
 
Copy content sage_gap:G.CompositionSeries()
 
Nilpotency class:$2$
Copy content comment:Nilpotency class of the group
 
Copy content magma:NilpotencyClass(G);
 
Copy content gap:NilpotencyClassOfGroup(G);
 
Copy content sage_gap:G.NilpotencyClassOfGroup()
 
Derived length:$2$
Copy content comment:Derived length of the group
 
Copy content magma:DerivedLength(G);
 
Copy content gap:DerivedLength(G);
 
Copy content sage_gap:G.DerivedLength()
 

This group is nonabelian, elementary for $p = 2$ (hence nilpotent, solvable, supersolvable, monomial, and hyperelementary), and metabelian.

Copy content comment:Determine if the group G is abelian
 
Copy content magma:IsAbelian(G);
 
Copy content gap:IsAbelian(G);
 
Copy content sage:G.is_abelian()
 
Copy content sage_gap:G.IsAbelian()
 
Copy content comment:Determine if the group G is cyclic
 
Copy content magma:IsCyclic(G);
 
Copy content gap:IsCyclic(G);
 
Copy content sage:G.is_cyclic()
 
Copy content sage_gap:G.IsCyclic()
 
Copy content comment:Determine if the group G is nilpotent
 
Copy content magma:IsNilpotent(G);
 
Copy content gap:IsNilpotentGroup(G);
 
Copy content sage:G.is_nilpotent()
 
Copy content sage_gap:G.IsNilpotentGroup()
 
Copy content comment:Determine if the group G is solvable
 
Copy content magma:IsSolvable(G);
 
Copy content gap:IsSolvableGroup(G);
 
Copy content sage:G.is_solvable()
 
Copy content sage_gap:G.IsSolvableGroup()
 
Copy content comment:Determine if the group G is supersolvable
 
Copy content gap:IsSupersolvableGroup(G);
 
Copy content sage:G.is_supersolvable()
 
Copy content sage_gap:G.IsSupersolvableGroup()
 
Copy content comment:Determine if the group G is simple
 
Copy content magma:IsSimple(G);
 
Copy content gap:IsSimpleGroup(G);
 
Copy content sage_gap:G.IsSimpleGroup()
 

Group statistics

Copy content comment:Compute statistics for the group G
 
Copy content magma:// Magma code to output the first two rows of the group statistics table element_orders := [Order(g) : g in G]; orders := Set(element_orders); printf "Orders: %o\n", orders; printf "Elements: %o %o\n", [#[x : x in element_orders | x eq n] : n in orders], Order(G); cc_orders := [cc[1] : cc in ConjugacyClasses(G)]; printf "Conjugacy classes: %o %o\n", [#[x : x in cc_orders | x eq n] : n in orders], #cc_orders;
 
Copy content gap:# Gap code to output the first two rows of the group statistics table element_orders := List(Elements(G), g -> Order(g)); orders := Set(element_orders); Print("Orders: ", orders, "\n"); element_counts := List(orders, n -> Length(Filtered(element_orders, x -> x = n))); Print("Elements: ", element_counts, " ", Size(G), "\n"); cc_orders := List(ConjugacyClasses(G), cc -> Order(Representative(cc))); cc_counts := List(orders, n -> Length(Filtered(cc_orders, x -> x = n))); Print("Conjugacy classes: ", cc_counts, " ", Length(ConjugacyClasses(G)), "\n");
 
Copy content sage:# Sage code to output the first two rows of the group statistics table element_orders = [g.order() for g in G] orders = sorted(list(set(element_orders))) print("Orders:", orders) print("Elements:", [element_orders.count(n) for n in orders], G.order()) cc_orders = [cc[0].order() for cc in G.conjugacy_classes()] print("Conjugacy classes:", [cc_orders.count(n) for n in orders], len(cc_orders))
 

Order 1 2 4 19 38 76
Elements 1 7 8 18 126 144 304
Conjugacy classes   1 5 4 18 90 72 190
Divisions 1 5 2 1 5 2 16
Autjugacy classes 1 3 1 1 3 1 10

Copy content comment:Compute statistics about the characters of G
 
Copy content magma:// Outputs [<d_1,c_1>, <d_2,c_2>, ...] where c_i is the number of irr. complex chars. of G with degree d_i CharacterDegrees(G);
 
Copy content gap:# Outputs [[d_1,c_1], [d_2,c_2], ...] where c_i is the number of irr. complex chars. of G with degree d_i CharacterDegrees(G);
 
Copy content sage:# Outputs [[d_1,c_1], [d_2,c_2], ...] where c_i is the number of irr. complex chars. of G with degree d_i character_degrees = [c[0] for c in G.character_table()] [[n, character_degrees.count(n)] for n in set(character_degrees)]
 
Copy content sage_gap:G.CharacterDegrees()
 

Dimension 1 2 18 36
Irr. complex chars.   152 38 0 0 190
Irr. rational chars. 4 4 4 4 16

Minimal presentations

Permutation degree:$27$
Transitive degree:$152$
Rank: $2$
Inequivalent generating pairs: $60$

Minimal degrees of faithful linear representations

Over $\mathbb{C}$ Over $\mathbb{R}$ Over $\mathbb{Q}$
Irreducible none none none
Arbitrary 3 4 22

Constructions

Show commands: Gap / Magma / SageMath


Presentation: $\langle a, b, c \mid a^{2}=b^{4}=c^{38}=[a,c]=[b,c]=1, b^{a}=bc^{19} \rangle$ Copy content Toggle raw display
Copy content comment:Define the group with the given generators and relations
 
Copy content magma:G := PCGroup([5, -2, -2, -2, -2, -19, 1541, 26, 58]); a,b,c := Explode([G.1, G.2, G.4]); AssignNames(~G, ["a", "b", "b2", "c", "c2"]);
 
Copy content gap:G := PcGroupCode(80120759768163665,304); a := G.1; b := G.2; c := G.4;
 
Copy content sage:# This uses Sage's interface to GAP, as Sage (currently) has no native support for PC groups G = gap.new('PcGroupCode(80120759768163665,304)'); a = G.1; b = G.2; c = G.4;
 
Copy content sage_gap:# This uses Sage's interface to GAP, as Sage (currently) has no native support for PC groups G = gap.new('PcGroupCode(80120759768163665,304)'); a = G.1; b = G.2; c = G.4;
 
Permutation group:Degree $27$ $\langle(1,6,2,5)(3,8,4,7), (1,2)(3,4)(5,8)(6,7), (9,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10), (1,3)(2,4)(5,7)(6,8), (1,2)(3,4)(5,6)(7,8)\rangle$ Copy content Toggle raw display
Copy content comment:Define the group as a permutation group
 
Copy content magma:G := PermutationGroup< 27 | (1,6,2,5)(3,8,4,7), (1,2)(3,4)(5,8)(6,7), (9,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10), (1,3)(2,4)(5,7)(6,8), (1,2)(3,4)(5,6)(7,8) >;
 
Copy content gap:G := Group( (1,6,2,5)(3,8,4,7), (1,2)(3,4)(5,8)(6,7), (9,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10), (1,3)(2,4)(5,7)(6,8), (1,2)(3,4)(5,6)(7,8) );
 
Copy content sage:G = PermutationGroup(['(1,6,2,5)(3,8,4,7)', '(1,2)(3,4)(5,8)(6,7)', '(9,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10)', '(1,3)(2,4)(5,7)(6,8)', '(1,2)(3,4)(5,6)(7,8)'])
 
Matrix group:$\left\langle \left(\begin{array}{rr} 39 & 0 \\ 0 & 39 \end{array}\right), \left(\begin{array}{rr} 37 & 19 \\ 0 & 37 \end{array}\right), \left(\begin{array}{rr} 37 & 38 \\ 38 & 37 \end{array}\right), \left(\begin{array}{rr} 1 & 4 \\ 0 & 1 \end{array}\right), \left(\begin{array}{rr} 1 & 38 \\ 0 & 1 \end{array}\right) \right\rangle \subseteq \GL_{2}(\Z/76\Z)$
Copy content comment:Define the group as a matrix group with coefficients in GLZN
 
Copy content magma:G := MatrixGroup< 2, Integers(76) | [[39, 0, 0, 39], [37, 19, 0, 37], [37, 38, 38, 37], [1, 4, 0, 1], [1, 38, 0, 1]] >;
 
Copy content gap:G := Group([[[ZmodnZObj(39,76), ZmodnZObj(0,76)], [ZmodnZObj(0,76), ZmodnZObj(39,76)]],[[ZmodnZObj(37,76), ZmodnZObj(19,76)], [ZmodnZObj(0,76), ZmodnZObj(37,76)]],[[ZmodnZObj(37,76), ZmodnZObj(38,76)], [ZmodnZObj(38,76), ZmodnZObj(37,76)]],[[ZmodnZObj(1,76), ZmodnZObj(4,76)], [ZmodnZObj(0,76), ZmodnZObj(1,76)]],[[ZmodnZObj(1,76), ZmodnZObj(38,76)], [ZmodnZObj(0,76), ZmodnZObj(1,76)]]]);
 
Copy content sage:MS = MatrixSpace(Integers(76), 2, 2) G = MatrixGroup([MS([[39, 0], [0, 39]]), MS([[37, 19], [0, 37]]), MS([[37, 38], [38, 37]]), MS([[1, 4], [0, 1]]), MS([[1, 38], [0, 1]])])
 
Direct product: $C_{19}$ $\, \times\, $ $(C_2^2:C_4)$
Semidirect product: $C_2^2$ $\,\rtimes\,$ $C_{76}$ (2) $(C_2\times C_{76})$ $\,\rtimes\,$ $C_2$ (2) $(C_2\times C_{38})$ $\,\rtimes\,$ $C_4$ (2) $(C_2\times C_4)$ $\,\rtimes\,$ $C_{38}$ (2) more information
Trans. wreath product: not isomorphic to a non-trivial transitive wreath product
Non-split product: $C_{38}$ . $D_4$ (2) $C_2^3$ . $C_{38}$ $C_2$ . $(D_4\times C_{19})$ (2) $C_{38}$ . $(C_2\times C_4)$ all 8

Elements of the group are displayed as words in the presentation generators from the presentation above.

Homology

Abelianization: $C_{2} \times C_{76} \simeq C_{2} \times C_{4} \times C_{19}$
Copy content comment:The abelianization of the group
 
Copy content magma:quo< G | CommutatorSubgroup(G) >;
 
Copy content gap:FactorGroup(G, DerivedSubgroup(G));
 
Copy content sage:G.quotient(G.commutator())
 
Schur multiplier: $C_{2}^{2}$
Copy content comment:The Schur multiplier of the group
 
Copy content gap:AbelianInvariantsMultiplier(G);
 
Copy content sage:G.homology(2)
 
Copy content sage_gap:G.AbelianInvariantsMultiplier()
 
Commutator length: $1$
Copy content comment:The commutator length of the group
 
Copy content gap:CommutatorLength(G);
 
Copy content sage_gap:G.CommutatorLength()
 

Subgroups

Copy content comment:List of subgroups of the group
 
Copy content magma:Subgroups(G);
 
Copy content gap:AllSubgroups(G);
 
Copy content sage:G.subgroups()
 
Copy content sage_gap:G.AllSubgroups()
 

There are 46 subgroups in 34 conjugacy classes, 22 normal (10 characteristic).

Characteristic subgroups are shown in this color. Normal (but not characteristic) subgroups are shown in this color.

Special subgroups

Center: $Z \simeq$ $C_2\times C_{38}$ $G/Z \simeq$ $C_2^2$
Copy content comment:Center of the group
 
Copy content magma:Center(G);
 
Copy content gap:Center(G);
 
Copy content sage:G.center()
 
Copy content sage_gap:G.Center()
 
Commutator: $G' \simeq$ $C_2$ $G/G' \simeq$ $C_2\times C_{76}$
Copy content comment:Commutator subgroup of the group G
 
Copy content magma:CommutatorSubgroup(G);
 
Copy content gap:DerivedSubgroup(G);
 
Copy content sage:G.commutator()
 
Copy content sage_gap:G.DerivedSubgroup()
 
Frattini: $\Phi \simeq$ $C_2^2$ $G/\Phi \simeq$ $C_2\times C_{38}$
Copy content comment:Frattini subgroup of the group G
 
Copy content magma:FrattiniSubgroup(G);
 
Copy content gap:FrattiniSubgroup(G);
 
Copy content sage:G.frattini_subgroup()
 
Copy content sage_gap:G.FrattiniSubgroup()
 
Fitting: $\operatorname{Fit} \simeq$ $C_2^2:C_{76}$ $G/\operatorname{Fit} \simeq$ $C_1$
Copy content comment:Fitting subgroup of the group G
 
Copy content magma:FittingSubgroup(G);
 
Copy content gap:FittingSubgroup(G);
 
Copy content sage:G.fitting_subgroup()
 
Copy content sage_gap:G.FittingSubgroup()
 
Radical: $R \simeq$ $C_2^2:C_{76}$ $G/R \simeq$ $C_1$
Copy content comment:Radical of the group G
 
Copy content magma:Radical(G);
 
Copy content gap:SolvableRadical(G);
 
Copy content sage_gap:G.SolvableRadical()
 
Socle: $\operatorname{soc} \simeq$ $C_2\times C_{38}$ $G/\operatorname{soc} \simeq$ $C_2^2$
Copy content comment:Socle of the group G
 
Copy content magma:Socle(G);
 
Copy content gap:Socle(G);
 
Copy content sage:G.socle()
 
Copy content sage_gap:G.Socle()
 
2-Sylow subgroup: $P_{ 2 } \simeq$ $C_2^2:C_4$
19-Sylow subgroup: $P_{ 19 } \simeq$ $C_{19}$

Subgroup diagram and profile

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Subgroup information

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Series

Derived series $C_2^2:C_{76}$ $\rhd$ $C_2$ $\rhd$ $C_1$
Copy content comment:Derived series of the group GF
 
Copy content magma:DerivedSeries(G);
 
Copy content gap:DerivedSeriesOfGroup(G);
 
Copy content sage:G.derived_series()
 
Copy content sage_gap:G.DerivedSeriesOfGroup()
 
Chief series $C_2^2:C_{76}$ $\rhd$ $C_2^2\times C_{38}$ $\rhd$ $C_2\times C_{38}$ $\rhd$ $C_{38}$ $\rhd$ $C_{19}$ $\rhd$ $C_1$
Copy content comment:Chief series of the group G
 
Copy content magma:ChiefSeries(G);
 
Copy content gap:ChiefSeries(G);
 
Copy content sage_gap:G.ChiefSeries()
 
Lower central series $C_2^2:C_{76}$ $\rhd$ $C_2$ $\rhd$ $C_1$
Copy content comment:The lower central series of the group G
 
Copy content magma:LowerCentralSeries(G);
 
Copy content gap:LowerCentralSeriesOfGroup(G);
 
Copy content sage:G.lower_central_series()
 
Copy content sage_gap:G.LowerCentralSeriesOfGroup()
 
Upper central series $C_1$ $\lhd$ $C_2\times C_{38}$ $\lhd$ $C_2^2:C_{76}$
Copy content comment:The upper central series of the group G
 
Copy content magma:UpperCentralSeries(G);
 
Copy content gap:UpperCentralSeriesOfGroup(G);
 
Copy content sage:G.upper_central_series()
 
Copy content sage_gap:G.UpperCentralSeriesOfGroup()
 

Supergroups

This group is a maximal subgroup of 30 larger groups in the database.

This group is a maximal quotient of 16 larger groups in the database.

Character theory

Copy content comment:Character table
 
Copy content magma:CharacterTable(G); // Output not guaranteed to exactly match the LMFDB table
 
Copy content gap:CharacterTable(G); # Output not guaranteed to exactly match the LMFDB table
 
Copy content sage:G.character_table() # Output not guaranteed to exactly match the LMFDB table
 
Copy content sage_gap:G.CharacterTable() # Output not guaranteed to exactly match the LMFDB table
 

Complex character table

See the $190 \times 190$ character table (warning: may be slow to load). Alternatively, you may search for characters of this group with desired properties.

Rational character table

1A 2A 2B 2C 2D 2E 4A 4B 19A 38A 38B 38C 38D 38E 76A 76B
Size 1 1 1 1 2 2 4 4 18 18 18 18 36 36 72 72
2 P 1A 1A 1A 1A 1A 1A 2B 2C 19A 19A 19A 19A 19A 19A 38B 38C
19 P 1A 2A 2B 2C 2D 2E 4A 4B 19A 38A 38B 38C 38D 38E 76A 76B
304.20.1a 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
304.20.1b 1 1 1 1 −1 −1 −1 1 1 1 1 1 −1 −1 1 1
304.20.1c 1 1 1 1 −1 −1 1 −1 1 1 1 1 −1 −1 −1 −1
304.20.1d 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1
304.20.1e 2 2 −2 −2 −2 2 0 0 2 2 −2 −2 −2 2 0 0
304.20.1f 2 2 −2 −2 2 −2 0 0 2 2 −2 −2 2 −2 0 0
304.20.1g 18 18 18 18 18 18 18 18 −1 −1 −1 −1 −1 −1 −1 −1
304.20.1h 18 18 18 18 −18 −18 −18 18 −1 −1 −1 −1 1 1 −1 −1
304.20.1i 18 18 18 18 −18 −18 18 −18 −1 −1 −1 −1 1 1 1 1
304.20.1j 18 18 18 18 18 18 −18 −18 −1 −1 −1 −1 −1 −1 1 1
304.20.1k 36 36 −36 −36 −36 36 0 0 −2 −2 2 2 2 −2 0 0
304.20.1l 36 36 −36 −36 36 −36 0 0 −2 −2 2 2 −2 2 0 0
304.20.2a 2 −2 −2 2 0 0 0 0 2 −2 2 2 0 0 0 0
304.20.2b 2 −2 2 −2 0 0 0 0 2 −2 −2 −2 0 0 0 0
304.20.2c 36 −36 −36 36 0 0 0 0 −2 2 −2 −2 0 0 0 0
304.20.2d 36 −36 36 −36 0 0 0 0 −2 2 2 2 0 0 0 0