ASQL is a query language based on object algebra. Also we discuss the rules of equivalence transform and can use these rules to process query optimization.
ASQL是基于对象代数的查询语言，本文讨论了对象代数表达式的等价变换规则，利用这些规则进行查询优化。
To classify the elements with similar relation, it is necessary to transform the similar matrix to equivalence matrix.
现实的分类问题往往伴有模糊性，对具有相似关系的元素进行分类，需要将相似矩阵改造为等价矩阵。
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