... equivalence of dependency 依赖的等价 equivalence of expression 表达式的等价 equivalence of fibre bundles 纤维丛等价 ...
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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。
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.
逻辑上，每个规则表达式都等价于一个状态机，而每个规则表达式的语法分析器都实现这个状态机。
Every regular expression is logically equivalent to a state machine, and the parser of every regular expression implements a state machine.
操作数的顺序与等价的中缀表达式中操作数的顺序一致。
The operands are in the same order that they would be in the equivalent infix expression.
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