作为本文的主要结果，关于交换环上矩阵的正点定理，零点定理和非负点定理被建立。

As the main results, it gives a Positivstellensatz, a Nullstellensatz and a Nichtnegativstellensatz for matrices over a commutative ring.

youdao

关联矩阵可由数值模拟结果统计而得，是对数值模拟结果中水体交换特征的提炼和归纳。

This matrix can be calculated by the results of numerical simulation, and can be considered as the extraction and conclusion of the water exchange character.

youdao