Reconciliation tries to satisfy the relations by creating missing elements, modifying existing elements, or deleting elements.
调和试图通过创建缺失的元素，修改现有的元素，或者删除元素来满足所有关联。
But one thing at a time. I wanted to point out to you that very often functions that you see in real life satisfy many nice relations between the partial derivatives.
但是有一件事情，我必须指出来，在现实中，很多函数的偏导数之间，存在着很好的关系。
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