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Acta Cryst. (1989) A45, 494-499

Definition of Symmetry Elements in Space Groups and Point Groups

Report of the International Union of Crystallography Ad-Hoc Committee on the Nomenclature of Symmetry*

By P. M. DE WOLFF (Chairman), Department of Applied Physics, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands

Y. BILLIET, Ecole Nationale d'Ingénieurs, BPW 3038 Sfax, Tunesië

J. D. H. DONNAY, Department of Geological Sciences, McGill University, 3450 University Street, Montreal, Canada H3A 2A7

W. FISCHER, Institut für Mineralogie, Petrologie und Kristallographie der Phillips-Universität, Lahnberge, D-3550 Marburg (Lahn), Federal Republic of Germany

R. B. GALIULIN, Institute of Crystallography, Academy of Sciences of the USSR, Leninsky Prospekt 59, Moscow 117333, USSR

A. M. GLAZER, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, England

MARJORIE SENECHAL, Department of Mathematics, Smith College, Northampton, MA 01063, USA

D. P. SHOEMAKER, Chemistry Department, Oregon State University, Corvallis, OR 97331, USA

H. WONDRATSCHEK, Institut für Kristallographie, Universität Karlsruhe, Kaiserstrasse 12, D-7500 Karlsruhe 1, Federal Republic of Germany

TH. HAHN (ex officio, IUCr President), Institut für Kristallographie, RWTH, Templergraben 55, D-5100 Aachen, Federal Republic of Germany

A. J. C. WILSON (ex officio, IUCr Commission on International Tables ), Crystallographic Data Centre, University Chemistry Laboratory, Lensfield Road, Cambridge CB2 1EW, England

and S. C. ABRAHAMS $\dagger$ (ex officio, IUCr Commission on Crystallographic Nomenclature), AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, NJ 07974, USA

(Received 24 November 1988; accepted 15 March 1989 )

*Appointed 14 November 1984 and 10 August 1987 (see Acta Cryst. (1986). A42, 64 for original membership) under ground rules outlined in Acta Cryst. (1979). A35, 1072. Final Report accepted 10 January 1989 by the IUCr Commission on Crystallographic Nomenclature and 15 March 1989 by the IUCr Commission on Crystallographic Nomenclature and 15 March 1989 by the Executive Committee.

$\dagger$ Present address: Institut für Kristallographie der Universität Tübingen, Charlottenstrasse 33, D-7400 Tübingen, Federal Republic of Germany.

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