| Description | Documentation from the Fourth Biennial Conference (1965). Includes: summary and indications of needed research from the conference in Essen (1963), and papers on 1) The New Role for Retention Signs in the Support Columns. 2) Presentation of Pin Problems, by Maria Szentpal, comments by Ann Hutchinson. 3) The Three Crosses of Axes, by Albrecht Knust. 4) The Fixed Points, comments by Albrecht Knust. 5) Dynamics (Strength Measurement Signs), by Ann Hutchinson. |