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View Equation

The database contains 327 equations (8 equations are awaiting activation).

Equation data
Category:4. Nonlinear Partial Differential Equations
Subcategory:4.4. Other Second-Order Equations
Equation(s):$\displaystyle \left(\frac{\partial^2 w}{\partial x\partial y}\right)^2-
\frac{\partial^2 w}{\partial x^2}\frac{\partial^2 w}{\partial y^2}-
2\frac{\partial^2 w}{\partial x^2}+(a+1)\frac{\partial^2 w}{\partial x\partial y}+a=0$.\hfill\break
Solution(s),
Transformation(s),
Integral(s)
:
The transformation
$$
U=\frac{\partial w}{\partial y}+x+2y,
\quad V=\frac{\partial w}{\partial x}+y, \quad T=\frac{\partial w}{\partial y}+x,
$$
leads to the equation
$$
\frac{\partial U}{\partial T}-\frac{1-a}{2}\frac{\partial U}{\partial V}=0.
$$
Its solution is $\,\displaystyle{U(V,T)=\Psi\left(T+\frac{2}{a-1}V\right)}$.
Hence, we have a first order PDE:
$$
\frac{\partial w}{\partial y}+x+2y=
\Phi\left((1-a)\left(\frac{\partial w}{\partial y}+x\right)+2\frac{\partial w}{\partial x}+
2y\right),
$$
where $\,\Phi\,$ is an arbitrary function.
Remarks:This result was obtained in co-authorship with L.V. Linchuk,
using generalized group analysis. The main idea of the method 
is outlined at EqWorld (http://eqworld.ipmnet.ru\slash 
ru/solutions/interesting.htm, in Russian).
Novelty:New equation(s) & solution(s) & transformation(s)
Author/Contributor's Details
Last name:Zaitsev
First name:Valentin
Middle(s) name:Feodorovich
Country:Russia
City:Saint-Petersburg
Statistic information
Submission date:Wed 09 Jan 2008 13:14
Edits by author:0

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