线要素化简一直是自动制图综合中的重要研究内容。
A study on the multi-solution of simplifying logic function with Karnaugh map;
自动制图综合是一国际性难题，国内外学者对其进行了多年研究，但普遍认为尚无实质性突破。
Automatic map Seneralization is an international difficult problem, many scholars have researched this problem for several years, but get no virtual improvement.
自动制图综合的研究长期以来未能取得突破性进展，原因之一是人们对制图综合的知识处理的深度不够。
The study on automated cartographic generalization has little breakthrough due to the lack of depth of generalization knowledge gained nowadays.
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