- Orbifold notation: *2222.
- Coxeter notation: [∞,2,∞] or [∞]×[∞]
- Lattice: rectangular
- Point group: D2
- The group p2mm has reflections in two perpendicular directions, and four rotation centres of order two (180°) located at the intersections of the reflection axes
No comments:
Post a Comment
sorry for the interactoin i can clear that now.thak you.