A Particular Integrals of PDEs

  • A
  • Thread starter Thread starter vgarg
  • Start date Start date
  • Tags Tags
    Integration
vgarg
Messages
11
Reaction score
0
TL;DR Summary
Partial integration
Can someone please explain the steps for the integrations in red circles on the attached page? This a page from Riley, Hobson, Bence - Mathematical Methods for Physics and Engineering 2006 edition.
Thank you.
 

Attachments

Physics news on Phys.org
vgarg said:
TL;DR Summary: Partial integration

Can someone please explain the steps for the integrations in red circles on the attached page? This a page from Riley, Hobson, Bence - Mathematical Methods for Physics and Engineering 2006 edition.
Thank you.
If you have a function of a single variable whose derivative is zero, then that function must be a constant. If you have a function of two variables whose derivative is zero with respect to one of the variables, then it must be a function only of the other variable.
 
PS you should try to find a function of two variables whose mixed second partial derivative is zero. In general, I'd you don't understand something like this, trying to find a counterexample or otherwise prove it's wrong is is good way to understand why it's correct.
 
  • Like
Likes martinbn and DaveE
Back
Top