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.

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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

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