Abstract
In ordinary geonetrical modelling systems, set operations, eg union, intersection and difference, are described by dyadic operators. This kind of definition leads to a binary-tree structure. In this paper a method is presented where only monadic set operators are used to describe the model completely. With this method the definition structure can be expressed as a list structure only. A further feature of this model is that a special procedure to define symmetry and/or periodic repetitions of a certain shape can be easily added. A program which uses this method has been written to test the model and some drawings produced by this program are shown in this paper.
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