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Properties

Label 80.5
Order \( 2^{4} \cdot 5 \)
Exponent \( 2^{3} \cdot 5 \)
Nilpotent no
Solvable yes
$\card{G^{\mathrm{ab}}}$ \( 2^{3} \)
$\card{Z(G)}$ \( 2^{2} \)
$\card{\Aut(G)}$ \( 2^{5} \cdot 5 \)
$\card{\mathrm{Out}(G)}$ \( 2^{3} \)
Perm deg. $13$
Trans deg. $40$
Rank $2$

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Show commands: Gap / Magma / SageMath

Copy content magma:G := SmallGroup(80, 5);
 
Copy content gap:G := SmallGroup(80, 5);
 
Copy content sage_gap:G = libgap.SmallGroup(80, 5)
 
Copy content comment:Define the group as a permutation group
 
Copy content sage:G = PermutationGroup(['(2,5)(6,8)(10,11)(12,13)', '(1,2,3,6,4,5,7,8)', '(1,3,4,7)(2,6,5,8)', '(1,4)(2,5)(3,7)(6,8)', '(9,10,12,13,11)'])
 

Group information

Description:$C_{40}:C_2$
Order: \(80\)\(\medspace = 2^{4} \cdot 5 \)
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: \(40\)\(\medspace = 2^{3} \cdot 5 \)
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:$C_2^3\times F_5$, of order \(160\)\(\medspace = 2^{5} \cdot 5 \)
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, $C_5$
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()
 
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, metacyclic (hence solvable, supersolvable, monomial, and metabelian), and hyperelementary for $p = 2$.

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 5 8 10 20 40
Elements 1 11 12 4 24 4 8 16 80
Conjugacy classes   1 2 3 2 4 2 4 8 26
Divisions 1 2 2 1 2 1 1 1 11
Autjugacy classes 1 2 2 1 2 1 1 1 11

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 4 8 16
Irr. complex chars.   8 18 0 0 0 26
Irr. rational chars. 4 2 3 1 1 11

Minimal presentations

Permutation degree:$13$
Transitive degree:$40$
Rank: $2$
Inequivalent generating pairs: $12$

Minimal degrees of faithful linear representations

Over $\mathbb{C}$ Over $\mathbb{R}$ Over $\mathbb{Q}$
Irreducible 2 4 16
Arbitrary 2 4 8

Constructions

Show commands: Gap / Magma / SageMath


Presentation: $\langle a, b \mid a^{2}=b^{40}=1, b^{a}=b^{29} \rangle$ 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, -5, 581, 26, 542, 42, 1443, 58, 1604]); a,b := Explode([G.1, G.2]); AssignNames(~G, ["a", "b", "b2", "b4", "b8"]);
 
Copy content gap:G := PcGroupCode(13415485082131757059,80); a := G.1; b := G.2;
 
Copy content sage:# This uses Sage's interface to GAP, as Sage (currently) has no native support for PC groups G = gap.new('PcGroupCode(13415485082131757059,80)'); a = G.1; b = G.2;
 
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(13415485082131757059,80)'); a = G.1; b = G.2;
 
Permutation group:Degree $13$ $\langle(2,5)(6,8)(10,11)(12,13), (1,2,3,6,4,5,7,8), (1,3,4,7)(2,6,5,8), (1,4)(2,5)(3,7)(6,8), (9,10,12,13,11)\rangle$ Copy content Toggle raw display
Copy content comment:Define the group as a permutation group
 
Copy content magma:G := PermutationGroup< 13 | (2,5)(6,8)(10,11)(12,13), (1,2,3,6,4,5,7,8), (1,3,4,7)(2,6,5,8), (1,4)(2,5)(3,7)(6,8), (9,10,12,13,11) >;
 
Copy content gap:G := Group( (2,5)(6,8)(10,11)(12,13), (1,2,3,6,4,5,7,8), (1,3,4,7)(2,6,5,8), (1,4)(2,5)(3,7)(6,8), (9,10,12,13,11) );
 
Copy content sage:G = PermutationGroup(['(2,5)(6,8)(10,11)(12,13)', '(1,2,3,6,4,5,7,8)', '(1,3,4,7)(2,6,5,8)', '(1,4)(2,5)(3,7)(6,8)', '(9,10,12,13,11)'])
 
Matrix group:$\left\langle \left(\begin{array}{rr} 13 & 13 \\ 21 & 13 \end{array}\right), \left(\begin{array}{rr} 1 & 0 \\ 0 & 28 \end{array}\right) \right\rangle \subseteq \GL_{2}(\F_{29})$
Copy content comment:Define the group as a matrix group with coefficients in GLFp
 
Copy content magma:G := MatrixGroup< 2, GF(29) | [[13, 13, 21, 13], [1, 0, 0, 28]] >;
 
Copy content gap:G := Group([[[ Z(29)^18, Z(29)^18 ], [ Z(29)^17, Z(29)^18 ]], [[ Z(29)^0, 0*Z(29) ], [ 0*Z(29), Z(29)^14 ]]]);
 
Copy content sage:MS = MatrixSpace(GF(29), 2, 2) G = MatrixGroup([MS([[13, 13], [21, 13]]), MS([[1, 0], [0, 28]])])
 
Transitive group: 40T28 more information
Direct product: not isomorphic to a non-trivial direct product
Semidirect product: $C_8$ $\,\rtimes\,$ $D_5$ $C_{40}$ $\,\rtimes\,$ $C_2$ $C_5$ $\,\rtimes\,$ $\OD_{16}$ $(C_5:C_8)$ $\,\rtimes\,$ $C_2$ more information
Trans. wreath product: not isomorphic to a non-trivial transitive wreath product
Non-split product: $D_{10}$ . $C_4$ $C_4$ . $D_{10}$ $C_{20}$ . $C_2^2$ $(C_4\times D_5)$ . $C_2$ all 7

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

Homology

Abelianization: $C_{2} \times C_{4} $
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: $C_1$
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 50 subgroups in 20 conjugacy classes, 13 normal, and all normal subgroups are characteristic.

Characteristic subgroups are shown in this color.

Special subgroups

Center: $Z \simeq$ $C_4$ $G/Z \simeq$ $D_{10}$
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: $G' \simeq$ $C_{10}$ $G/G' \simeq$ $C_2\times C_4$
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: $\Phi \simeq$ $C_4$ $G/\Phi \simeq$ $D_{10}$
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: $\operatorname{Fit} \simeq$ $C_{40}$ $G/\operatorname{Fit} \simeq$ $C_2$
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: $R \simeq$ $C_{40}:C_2$ $G/R \simeq$ $C_1$
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: $\operatorname{soc} \simeq$ $C_{10}$ $G/\operatorname{soc} \simeq$ $C_2\times C_4$
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: $P_{ 2 } \simeq$ $\OD_{16}$
5-Sylow subgroup: $P_{ 5 } \simeq$ $C_5$

Subgroup diagram and profile

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Subgroup information

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Series

Derived series $C_{40}:C_2$ $\rhd$ $C_{10}$ $\rhd$ $C_1$
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 $C_{40}:C_2$ $\rhd$ $C_4\times D_5$ $\rhd$ $C_{20}$ $\rhd$ $C_{10}$ $\rhd$ $C_5$ $\rhd$ $C_1$
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 $C_{40}:C_2$ $\rhd$ $C_{10}$ $\rhd$ $C_5$
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 $C_1$ $\lhd$ $C_4$ $\lhd$ $C_8$
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 57 larger groups in the database.

This group is a maximal quotient of 51 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 $26 \times 26$ character table. Alternatively, you may search for characters of this group with desired properties.

Rational character table

1A 2A 2B 4A 4B 5A 8A 8B 10A 20A 40A
Size 1 1 10 2 10 4 4 20 4 8 16
2 P 1A 1A 1A 2A 2A 5A 4A 4A 5A 10A 20A
5 P 1A 2A 2B 4A 4B 1A 8A 8B 2A 4A 8A
80.5.1a 1 1 1 1 1 1 1 1 1 1 1
80.5.1b 1 1 −1 1 −1 1 −1 1 1 1 −1
80.5.1c 1 1 −1 1 −1 1 1 −1 1 1 1
80.5.1d 1 1 1 1 1 1 −1 −1 1 1 −1
80.5.1e 2 2 −2 −2 2 2 0 0 2 −2 0
80.5.1f 2 2 2 −2 −2 2 0 0 2 −2 0
80.5.2a 4 4 0 4 0 −1 4 0 −1 −1 −1
80.5.2b 4 −4 0 0 0 4 0 0 −4 0 0
80.5.2c 4 4 0 4 0 −1 −4 0 −1 −1 1
80.5.2d 8 8 0 −8 0 −2 0 0 −2 2 0
80.5.2e 16 −16 0 0 0 −4 0 0 4 0 0