STATUS OF VOL. A1: MAXIMAL SUBGROUPS OF SPACE AND PLANE GROUPS. Wondratschek, H., Institut fuer Kristallographie, Universitaet, D-76128 Karlsruhe Germany

In Vol. A of IT (1983) data on maximal subgroups of space groups are included. In these data the subgroups are listed partly individually, partly by type, or, for isomorphic subgroups, only by those of lowest indices.

The complete data were not available in 1983 but have been derived since. Following the demand by users of Vol. A the Executive Committee of IUCr has approved in August 1995 the publication of a new volume A1 under the title Maximal subgroups of space and plane groups. This volume will contain lists of maximal subgroups as well as Sections on their theory and their applications. The complete list of maximal subgroups of indices 2, 3, and 4 will be given. The infinitely many maximal isomorphic subgroups will be presented by formulae with the index as parameter. Classes of conjugate subgroups will be indicated. Where applicable, transformation to the standard description of the subgroup will be presented.

The state of the preparation of the volume at the time of the Congress will be explained.