...Chapter 2 Introduction to Partial Differential Equations 偏微分方程式 （PDE） 就是指含有偏导函数 （partial derivatives） 的方程式， 在常..
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偏微分或偏导数(Partial12.2 偏微分或偏导数(Partial Derivatives) 假设f是一个有两个变数x和y的函数,如果我们只让x变动而令y保持不变(亦即0yy=,其中0y是一个常数),则我们就等于是在考虑一个单变数...
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high-order partial derivatives 高阶偏导数
ratio of partial derivatives 偏微商比值
Second partial derivatives 第二阶偏微分
mixed partial derivatives 混合偏导数
In this paper, we have applied the derivative-dependent functional variableseparation approach to discuss the following (1+1)-dimensional nonlinear evolution equation with mixed partial derivatives which has certain physical contexts:E≡E(t，x，u，u_1，u_2，…，U_m，U_(1t)，U_(2t)，…，U_(nt))=0．we have obtained some important results:(1) We have proposed the new theory of the derivative-dependent functionalvariable separation for the (1+1)-dimensional nonlinear evolution equationwith mixed partial derivatives;(2)We have constructed a relation between the derivative-dependent functionalvariable separation for the above class of equations and the functional variable separation for whose corresponding systems of PDEs;(3)As an application, we have obtained complete classification of the general nonlinear evolution equations u_(xt)=A(u,u_x)u_(xxx)+B(u,u_x) that admit DDFSSsand some DDFSSs.
本论文运用导数相关泛函分离变量法，讨论了具有丰富物理背景的具混合偏导数的一般(1+1)维非线性演化方程E≡E(t，x，u，u_1，u_2，…，U_m，U_(1t)，U_(2t)，…，U_(nt))=0．得到了一些有意义的结果：(1)建立了该类型方程的导数相关泛函分离变量的一般理论；(2)建立了该类型方程的导数相关泛函分离变量与方程组的泛函分离变量的关系；(3)作为范例，给出了一般非线性演化方程u_(xt)=A(u，u_x)u_(xxx)+B(u，u_x)具有DDFSSs的完全归类和精确解。
参考来源 - 一类（1+1）维非线性演化方程的导数相关泛函分离变量·2,447,543篇论文数据，部分数据来源于NoteExpress
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