Help with this double integral

  • Thread starter eljose
  • Start date
497
0
i would need help with this integral:

[tex] \int_a^{\infty}\int_a^{\infty}dxdyF(y/x) [/tex]

now i make the change of variable y/x=u x=v then what would be the new integration limits?..thanks.

where a can be 0 or 1
 
Last edited:

dextercioby

Science Advisor
Homework Helper
Insights Author
12,928
504
U can't make that substitution. I hope you see why. Depending on the shape of the function "F", you may integrate directly. The integral may very easily diverge, but that wouldn't be a catastrophe, would it...?

Daniel.
 

mathman

Science Advisor
7,652
378
You can make u the inner integral. The limits will be a/x to inf. and you will have 1/x in the integrand. v=x is irrelevant - it doesn't change anything.
 

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top