Finite Group Databasebeta
Cayley diagram

C9⋊Dic9 #66327

order324
isoclinismisoclinic class of C9⋊D9
automorphism?
homologyAbelianization (H1) = C4 · Schur multiplier (H2) = C9

Aliases

unambiguous semidirect productC9⋊Dic9

Splittings

derived, SylowC92 ⋊ C4

Subgroups

subgroupG/H
center, hypercenterC2C9⋊D9
commutator, hypocenterC92C4
Frattini, socle, prime radicalC2×C32C3⋊D3
Fitting, cosocleC2×C92C2
LCSG ▷ C92
UCSC1 ◁ C2

69 conjugacy classes of subgroups.

Full subgroup data →

Presentation

minimal degreeμ(G) = 22
transitive degreeμt(G) = 324

A minimal faithful permutation representation — 3 generators on 22 points:

(1,2,3,4)(6,8)(7,11)(9,10)(12,13)(15,17)(16,20)(18,19)(21,22);(14,22,17,20,19,18,16,15,21);(5,13,8,11,10,9,7,6,12)

Polycyclic presentation:

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

Conjugacy classes & character table

84 conjugacy classes — view the full character table.

Relationships

derived subgroup of#13046939, #13046940, #13046941
maximal subgroup of#10619526, D9×Dic9, #10619529, …
maximal normal subgroup of#10619526, D9×Dic9, #10619529, …
maximal quotient ofC9⋊(C9⋊C8), C2×C9⋊Dic9, #11757320, …

GAP

Construct this group in GAP via the SmallGroups library:

gap> SmallGroup(324, 19);