P is a kind of basic method to successive temperature controlling. Its characteristic is the deviation value in direct proportion relation that outputs and inputs.

比例温度控制（P）是一种的连续温度控制方式，它的特点是输出与输入的偏差值成比例关系。

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In this paper, the theories and methods to simplify the relation schema with keeping equal candidate keys by successive elimination technologies are given.

本文研究了通过消元法将一个关系模式化成与之具有相同候选关键字的一组简单关系模式的理论和方法。

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