38:42

Plane groups - International Crystallographic Tables

26:56

Liquid Crystals pt1 Definitions

12:00

Plane group PRACTICE

6:31

Mineralogy, Crystallography: Point Symmetry, Mirror Planes

13:24

Concept of point group, space group, reciprocal lattice, diffraction and imaging

25:17

Lecture 1 Translational Symmetry in 2D

38:02

Lesson 8: Puzzles to Exercise the Mind

19:02

The Beauty of Symmetry: An Introduction to the Wallpaper Group