解释命题、命题逻辑和其涉及的否定、合取、析取、蕴涵和等价等定义，同时分析它们的形式和用法。
This paper explains the proposition and propositional logic, giving the definitions, forms and usages of negation, conjunction, disjunction, implication and equivalence.
而要使译文评析取得应有的效果，必须兼顾译文评析的内容与形式。
And should make the comments obtain due effect, must be balanced in the analysis of the content and form.
由软件的形式规格说明构造分类树，再把由分类树方法得到的测试用例转化为析取范式，进一步精炼测试用例。
Firstly, a classification-tree is constructed based on specification of the test object, and then test cases obtained from the classification-tree are refined by generating a disjunctive normal form.
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