As discussed before, strict duality exists in the four-dimensiona.l computations. Since the data for computations are stored in the data structure of a computer aided geometric design system, however, it is necessary to dualize the relevant topology relations and data structure in order to attain a total duality. This is the reason why Chapters 17 and 18 are included in this book.
KeywordsLine Segment Euler Characteristic Open Surface Closed Surface Geometric Figure
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