Finite Group DatabasebetaFinite Group Databasebeta| order | 128 |
| nilpotency class | 3 |
| isoclinism | isoclinic class of #2002 |
| automorphism | Aut(G) = C22×#511771 (order 2048) · Inn(G) = #120 · Out(G) = C23×D4 |
| homology | Abelianization (H1) = C23 · Schur multiplier (H2) = C23 |
No aliases for this group.
| subgroup | G/H | |
|---|---|---|
| center, socle | C22 | #120 |
| commutator, Frattini, cosocle | C22×C4 | C23 |
| prime radical | #537 | C2 |
| LCS | G ▷ C22×C4 ▷ C2 ▷ C1 | |
| UCS | C1 ◁ C22 ◁ C22×C4 ◁ G | |
| LECS | G ▷ C22×C4 ▷ C2 ▷ C1 | |
145 conjugacy classes of subgroups.
| minimal degree | μ(G) = 20 |
| transitive degree | μt(G) = 32 |
A minimal faithful permutation representation — 3 generators on 20 points:
(2,3)(5,6)(7,15)(8,13)(9,12)(10,14)(11,17)(16,20)(18,19);(1,2)(3,4)(5,7)(6,11)(8,17)(9,18)(10,16)(12,20)(13,15)(14,19);(1,3,4,2)(6,12)(7,16)(9,10)(13,14)(17,18)(19,20)Polycyclic presentation:
2^7|c^2=dg,e^2=g,f^2=g,b^a=bd,c^a=ce,e^a=eg,c^b=cf,f^b=fg,e^c=eg,f^c=fg26 conjugacy classes — view the full character table.
| maximal subgroup of | #7416, #12141, #12143, … |
| maximal normal subgroup of | #7416, #12141, #12143, … |
| maximal quotient of | #10403, #10404, #10407, … |
Construct this group in GAP via the SmallGroups library:
gap> SmallGroup(128, 772);