例如，这种理论模型允许用更有效的等价操作来代替关系代数操作同时不影响结果。
This theoretical model allows, for example, that relational algebra operations to be replaced by more efficient equivalent operations whereas not interfere with the result.
其实概念一点儿不复杂，只要有些简单的代数知识，你也能心算，这样谈判起来就更有效了。
The concepts are actually not complicated, and with a few simple algebraic tips you will be able to do the math in your head as well, leading to more effective negotiation.
说明了用组合分析方法证明代数恒等式的有效性和实用性。
It shows the effectiveness and practicability of the approach to prove algebraic identies with combinatorial analysis.
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