N-1-1-020.23 Mathematics, by Flemming Topsoe*, An issue of central importance for efficient electronic interchange and processing of mathematical documents is that of standard representation. In order not to limit future possibilities, the representation should reflect structure, i.e., mathematical semantic content (rather than layout). A completely faithful representation is neither feasible nor desirable. The best chance to achieve a result within a short time horizon seems to be to agree on a selection of DTD's (Document Type Definitions) in the sense of SGML (Standardized General Markup Language) in order to define types of Mathematical Documents (Articles, Expressions, etc.). A committee with an aim as indicated above has just been formed as a sub-committee of a committee sponsored by AAP (American Association of Publishers). The committee is chaired by William B. Woolf of the AMS (American Mathematical Society) and will base its work on suggestions and results already obtained by the following organizations or projects: AAP AMS Arbortext Euromath Project, ISO (TR 9573) TEI (Text Encoding Initiative) It is an absolute necessity that professional mathematicians take an active part in this work. Interested persons should contact the chairman, W.B.Woolf . *Professor, University of Copenhagen, Mathematical Institute