These on-line lecture notes describe elementary concepts of symmetry appropriate for undergraduates. Topic headings include:
Simple Symmetry Operations
Combination of Symmetry Elements in Finite Groups
Symmetry Elements in Arrays
Space Groups
International Tables for X-Ray Crystallography, Volume I

Citation: L.S. Dent Glasser, "Symmetry." Copyright © 1984, 1997 International Union of Crystallography.

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Many other Crystallographic Teaching Pamphlets from the IUCr containing lecture notes and graphics are also available at the following link:
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