Finite Group Databasebeta

D21×B(4,𝔽2) #72244281

order2688
automorphism?
homologyAbelianization (H1) = C24 · Schur multiplier (H2) = C27

Aliases

direct productD21×B(4,𝔽2)

Splittings

FittingC3×C7×B(4,𝔽2) ⋊ C2
HallC3×C7 ⋊ C2×B(4,𝔽2)
SylowC7 ⋊ D3×B(4,𝔽2)
SylowC3 ⋊ D7×B(4,𝔽2)

Subgroups

subgroupG/H
centerC2#120×D21
commutator, cosocleC23×C3×C7C24
FrattiniC23C23×D21
FittingC3×C7×B(4,𝔽2)C2
socleC2×C3×C7C2×#120
hypercenterB(4,𝔽2)D21
hypocenterC3×C7C2×B(4,𝔽2)
LCSG ▷ C23×C3×C7 ▷ C2×C3×C7 ▷ C3×C7
UCSC1 ◁ C2 ◁ C23 ◁ B(4,𝔽2)

2036 conjugacy classes of subgroups; only the 189 normal subgroups are shown.

normal subgroups only

This group has 2036 conjugacy classes of subgroups — too many to draw. Only its 189 normal subgroups are shown.

Dotted edges: containments with no intermediate normal subgroup — omitted non-normal subgroups may lie between.

Full subgroup data →

Presentation

minimal degreeμ(G) = 18
transitive degreeμt(G) = 168

A minimal faithful permutation representation — 4 generators on 18 points:

(1,2,4,6,7,5,3)(8,9,10)(11,13)(12,15)(14,17)(16,18);(2,3)(4,5)(6,7)(9,10);(15,18);(11,12,14,16)(13,15,17,18)

Conjugacy classes & character table

192 conjugacy classes — view the full character table.

Relationships

maximal subgroup ofD3×D7×B(4,𝔽2), B(4,𝔽2)×C3⋊AGL(1,𝔽7)
maximal normal subgroup ofD3×D7×B(4,𝔽2), B(4,𝔽2)×C3⋊AGL(1,𝔽7)

GAP

Past the SmallGroups library coverage — no SmallGroups id. Construct it from a minimal faithful permutation representation:

gap> G := Group((1,2,4,6,7,5,3)(8,9,10)(11,13)(12,15)(14,17)(16,18), (2,3)(4,5)(6,7)(9,10), (15,18), (11,12,14,16)(13,15,17,18));