The Fourth, Revised Edition of Volume A, published in March 1995, has sold so well that a Corrected Reprint became necessary, which appeared in October 1996. It contains corrections of all errors and flaws known at that time. A further reprint became necessary and appeared in June 1998.

The Fourth, Revised Edition of the Brief Teaching Edition of Volume A appeared in October 1996. It is based on the Corrected Reprint of the Fourth, Revised Edition of Volume A, mentioned above.

Preparations for the Fifth, Revised Edition of Volume A continued throughout the triennium. This edition will be completely ‘computerised’ in the following ways:

(i) The space-group tables in this volume (Sections 6 and 7) are being transferred to LaTeX files by M. Aroyo and his colleagues in Sofia, Bulgaria. These files will be the basis for the printing of the Fifth Edition. This work was completed by the end of 1998; checking of the data is in progress.

(ii) The remaining text sections will be re-keyed in Chester. The SGML conversion of these sections will be carried out in the second half of 1999.

The new edition will have a substantial number of corrections and small improvements. Three larger changes stand out:

(i) Systematic introduction of the new symbol ‘e’ for the ‘double glide plane’ throughout the volume; this symbol was first used in the Fourth Edition, but in a few places only.

(ii) Addition of a small new Section 9.4: Some Further Properties of Lattices by B. Gruber, Prague, Czech Republic.

(iii) Revision of some parts of Section 15 on normalisers, especially Table 15.3.2.

The scheduled publication date of the Fifth Edition is now the spring of 2000.

The Fifth Edition of Volume A will also be the basis of the Fifth Edition of the Brief Teaching Edition of Volume A.

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[1996] [2002] IUCr Triennial Report: Volume A. Space-Group Symmetry

Updated 6th June 1999