Partial Differential Equation: Can f(u) Satisfy the Equation dz/dx - dz/dy = 0?

Click For Summary
SUMMARY

The discussion focuses on the partial differential equation 2dz/dx - dz/dy = 0 and demonstrates that if z = f(x + 2y), where f(u) is a differential function of one variable, then the equation is satisfied. Participants suggest using a change of variables and applying the chain rule to find the partial derivatives of f with respect to x and y. This approach confirms that the proposed function z = f(x + 2y) meets the requirements of the equation.

PREREQUISITES
  • Understanding of partial differential equations (PDEs)
  • Familiarity with the chain rule in calculus
  • Knowledge of differential functions
  • Basic skills in variable substitution techniques
NEXT STEPS
  • Study the method of characteristics for solving PDEs
  • Learn about the implications of variable substitution in differential equations
  • Explore the application of the chain rule in multivariable calculus
  • Investigate the properties of differential functions in mathematical analysis
USEFUL FOR

Mathematicians, physics students, and anyone involved in solving partial differential equations or studying advanced calculus concepts.

jenuine
Messages
5
Reaction score
0
Consider the partial differential equation 2dz/dx-dz/dy=0
Show that if f(u) is a differential function of one variable, then the partial differential equation is satisfied by z=f(x+2y)




3. The Attempt at a Solution : Change of variables? No idea :S
 
Physics news on Phys.org
Here's a suggestion: DO WHAT IT SAYS! If z= f(x+ 2y), what is [itex]\partial f/\partial x[/itex]? What is [itex]\partial f/\partial y[/itex]? Let u= x+2y and use the chain rule.
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
Replies
5
Views
4K
  • · Replies 18 ·
Replies
18
Views
3K
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K