Finite Group Databasebeta
Cayley diagram

C9⋊D9 #4180

order162
isoclinismisoclinic class of C9⋊D9
automorphismAut(G) order 314928
homologyAbelianization (H1) = C2 · Schur multiplier (H2) = C9

Aliases

unambiguous semidirect productC9⋊D9

Splittings

Fitting, derived, SylowC92 ⋊ C2

Subgroups

subgroupG/H
center, hypercenterC1G
commutator, Fitting, cosocle, hypocenterC92C2
Frattini, socleC32C3⋊D3
LCSG ▷ C92
UCSC1

46 conjugacy classes of subgroups.

Full subgroup data →

Presentation

minimal degreeμ(G) = 18
transitive degreeμt(G) = 81

A minimal faithful permutation representation — 3 generators on 18 points:

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

Polycyclic presentation:

2,3^4|b^3=d^2,c^3=e^2,b^a=b^2d,c^a=c^2e,d^a=d^2,e^a=e^2

Conjugacy classes & character table

42 conjugacy classes — view the full character table.

Relationships

derived subgroup of#66343⋊C2, #10619734, D92⋊C4, …
maximal subgroup of#66343, D92, C2×C9⋊D9, …
maximal normal subgroup of#66343, D92, C2×C9⋊D9, …
maximal quotient ofC9⋊Dic9, C2×C9⋊D9, #92197, …

GAP

Construct this group in GAP via the SmallGroups library:

gap> SmallGroup(162, 16);