| 摘要 |
PROBLEM TO BE SOLVED: To provide the relation of computer aided geometric modeling to declation description with strong expression power and a working chip in a geometrical information unit (feature). SOLUTION: Information related to the volume, area, edges, points, and phase of an expression elementΓis integrated, declared and displayed based on logic having no relation with order. The expression elementΓconsists of individual base volume, the densityρof a real number (positive, zero, negative) is allocated to the base volume and the local connection of individual expression elementsΓis executed by the logical connecting operation of exchange and connection. A description plane related to important information is provided as a belonging-area plane between a volume plane and a phase plane and a belonging-edge plane between the volume plane and the phase plane in order to constitute relation among the volume plane to be a base plane for describing basic structure previously applied by synthesis, the phase plane to be a general geometry expression, phase structure, and volume for generating these planes and structure also in their mutual relation.
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