Transformation of a Cauchy-Euler equation

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SUMMARY

The discussion focuses on solving the Cauchy-Euler equation represented as x²y'' - xy' = ln x. The key transformation involves substituting x with e^t or t = ln x, which simplifies the equation. Participants emphasize the necessity of expressing the derivatives y' and y'' in terms of dy/dt and d²y/dt² to facilitate the solution process. This approach is essential for correctly applying the method of solving Cauchy-Euler equations.

PREREQUISITES
  • Understanding of Cauchy-Euler equations
  • Knowledge of differential calculus, specifically derivatives
  • Familiarity with substitution methods in differential equations
  • Basic grasp of logarithmic functions and their properties
NEXT STEPS
  • Study the method of solving Cauchy-Euler equations in detail
  • Learn how to express derivatives in terms of different variables
  • Explore examples of transformations in differential equations
  • Review the properties of logarithmic and exponential functions
USEFUL FOR

Students and educators in mathematics, particularly those focusing on differential equations, as well as anyone seeking to understand the transformation techniques for solving Cauchy-Euler equations.

jawhnay
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Homework Statement


x2y'' - xy' = ln x




Homework Equations


The problem I'm having is what do I do with x = et or t = ln x.


The Attempt at a Solution


I know you have to start with x = et or t = ln x however I'm not sure what to do next...
 
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You need to express ## y' = \frac {dy} {dx}, \ y'' = \frac {d^2y} {dx^2} ## in terms of ## \frac {dy} {dt} ## and ## \frac {d^2y} {dt^2} ##.
 

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