E N D
1. Lattices
3. 2-D Periodic Motif Array
4. Lattice + Motif
5. Point Lattice
6. 2-D Unit Cell
12. Lattices
13. Lattices
14. Lattices
15. Lattices
16. Primitive and Centered Cells
17. Refined Definition of Lattice
18. The Advantage of Periodicity