紧致依赖与内涵亏值

Compact Dependencies and Intent Waned Values

提出了"内涵亏值"与"紧致依赖"的概念,证明了由"紧致依赖"组成的依赖基对于"左部加属性、右部减属性"这一规则的公理系统是无冗余而完整的.由此发现了除Guigues-Duquenne基以外还有其他无冗余完整依赖基,改变了只有唯一的一个无冗余完整依赖基的传统观念,揭开了寻找多种无冗余完整依赖基以满足多样化需求的序幕.

In this paper, Intent Waned Values and Compact Dependency are proposed as new concepts. It has strictly been proven that a dependent foundation that consisted of compact dependencies is an irredundant and complete dependency basis on an axiom system that includes only one rule： attributes are increased at the left side and reduced at the right side. In this way, another irredundant and complete dependency basis is found, which is distinguished from the Guigues-Duquenne basis. This basis changes the traditional idea that there exists a sole irredundant and complete dependency basis and discloses the prospect of finding multiple kinds of irredundant and complete dependency basis for a variety of requirements.