代换是一个汉字词语,拼音是dài huàn,含义是替代;更换。
n. substitute
vt. replace
The odd point of plane differential systems=-y+δx+axy+my2+ly2n+1,y=G(x), is studied. The sufficient condition of the nonexistence of limit cycles for the system is obtained by means of comparing theorem, analyzing devergence and variable substitution.
通过研究微分系统x=-y+δx+axy+my2+ly2n+1,y=G(x)的奇点,借助比较定理,将该方程与其对称的方程进行比较,并通过分析散度和变量代换,得到了该系统极限环不存在的充分条件。
参考来源 - 一类平面微分系统的极限环的不存在性 Nonexistence of Limit Cycles for Some Plane Differential Systems·2,447,543篇论文数据,部分数据来源于NoteExpress
另一种方法很简单,只需代换现有的节点。
利用下面的代换,便于使这个问题无量纲化。
It is convenient to nondimensionalize this problem with the following substitutions .
事实上,我们可以做这种代换而仍能绕弯得出正确的本征函数和本征值。
In fact, we could make the substitution and still wind up with the correct eigenfunctions and eigenvalues.
So now let me just do some grade school substitution.
接下来做一些简单的代换。
So I've got this expression for prices here, here it is, and I want to plug it into that P there.
我们之前已经给出了价格的表达式,用它来代换这里的P
We want to do that because we have too many variables here. We've already got dV p we'll get rid of p as an additional variable and replace it with V which is already in here.
我们之所以要那么做,是因为这儿有太多变量了,我们已经有了dV,我们要把,作为额外的变量消去,用已存在的V代换它。
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