Find the solution of the equation uxy = ux

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SUMMARY

The equation uxy = ux is analyzed as a partial differential equation (PDE) rather than an ordinary differential equation (ODE). The solution process involves substituting ux = p and recognizing that the constant in the solution may depend on y. The general solution is expressed as u(x,y) = e^y ∫c(x)dx + g(y), where c(x) and g(y) are arbitrary functions. This approach emphasizes the integration with respect to x and the nature of solutions in PDEs.

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  • Familiarity with ordinary differential equations (ODEs)
  • Knowledge of integration techniques
  • Concept of arbitrary functions in mathematical solutions
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Mathematicians, students studying differential equations, and anyone involved in solving partial differential equations will benefit from this discussion.

kasse
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Homework Statement



Find the solution of the equation

uxy = ux

The Attempt at a Solution



ux = p

py = p

ln p = y + c*

p = ce^y

But them, what is u?
 
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Well, how would you solve the ORDINARY differential equation. dp/dx= p? That's seems to me very easy. Warning: because this is NOT an ordinary differential equation, the "constant" in the solution may be a function of y. Also remember that the general solution to a partial differential equation involves unknown FUNCTIONS.
 
Just integrate wrt. x so that

u(x,y) = e^y Int[c(x)]dx + g(y) where c(x) and g(y) are arbitrary?
 

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