Surface Integral Limits: Solving for u and v

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SUMMARY

The discussion centers on solving surface integrals with respect to the variables u and v, specifically for the integral ∫∫(u^2 + 3v^2)dudv. The participants clarify that the limits of integration can be set based on the triangular region defined in the uv-plane, allowing for flexibility in the order of integration. The recommended limits are u from 0 to 1 and v from 0 to 1-u, although the order can be reversed without affecting the outcome. The discussion emphasizes the importance of correctly interpreting the provided limits in the problem statement.

PREREQUISITES
  • Understanding of surface integrals and double integrals
  • Familiarity with vector calculus concepts such as ∂r/∂u and ∂r/∂v
  • Knowledge of the geometric interpretation of integration limits in the uv-plane
  • Experience with changing the order of integration in multiple integrals
NEXT STEPS
  • Study the geometric interpretation of double integrals in the uv-plane
  • Learn about changing the order of integration in surface integrals
  • Explore the application of the Divergence Theorem in vector calculus
  • Practice solving surface integrals with varying limits of integration
USEFUL FOR

Students and educators in calculus, particularly those focusing on vector calculus and surface integrals, as well as anyone seeking to improve their understanding of integration limits in multiple dimensions.

Woolyabyss
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Homework Statement


Problem is in image uploaded

Homework Equations


n/a

The Attempt at a Solution


x = u, y = v and z = 1 - u - v

∂r/∂u × ∂r/∂v = i + j + k
F dot N = u^2 + 3v^2

∫∫(u^2 + 3v^2 )dudv

My problem is I'm not sure what I should take as the limits?
Should I flip around the order of integration (dvdu) and have v go from 0 to 1-u and have u go from 0 to 1?
 

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Woolyabyss said:

Homework Statement


Problem is in image uploaded

Homework Equations


n/a

The Attempt at a Solution


x = u, y = v and z = 1 - u - v

∂r/∂u × ∂r/∂v = i + j + k
F dot N = u^2 + 3v^2

∫∫(u^2 + 3v^2 )dudv

My problem is I'm not sure what I should take as the limits?
Should I flip around the order of integration (dvdu) and have v go from 0 to 1-u and have u go from 0 to 1?

It doesn't matter which order you use for the integration. You have a triangle in the uv plane and you can do it either way. It isn't clear why your author changes the names of the variables from xy to uv instead of letting x and y just represent themselves. Set it up like you would any double integral.
 
They have given you the limits in the problem, where they write ##D=\{(u,v)\ :\ 0\leq u\ ...##. Have you tried using those? What did you get?
 

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