Groups whose commutator structure agrees: there are isomorphisms G/Z(G) → H/Z(H) and G′ → H′ carrying one commutator map to the other. The class spans orders — G × A is isoclinic to G for every abelian A.
Stem order 512: every member's order is a multiple of it, and the members attaining it — the stem groups — are marked ◆.
4 groups of the catalog are in this class.
| group | order | × stem | |
|---|---|---|---|
| #489347 | 512 | ×1 | ◆ stem |
| #489348 | 512 | ×1 | ◆ stem |
| #489349 | 512 | ×1 | ◆ stem |
| #489350 | 512 | ×1 | ◆ stem |
The class itself is infinite — G × A is isoclinic to G for every abelian A, and there are abelian groups of every order — so a table shows the part of it the catalog names, never the whole.