I Corollaries of the fundamental integral theorems

AI Thread Summary
The discussion focuses on the significance of corollaries derived from fundamental integral theorems, specifically their applications in fluid dynamics. The corollaries illustrate relationships between volume integrals and surface integrals, highlighting the importance of understanding these concepts for practical applications. They emphasize the physical interpretation of vector fields, such as temperature gradients and circulation. The discussion notes that while these formulas are useful, they are primarily valid in Cartesian coordinates, necessitating caution in their application. Overall, mastering these corollaries enhances comprehension of integral laws in physics and engineering contexts.
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Can anyone please tell me significance of these corollaries of fundamental integral theorems?
I can prove these corollaries but I don't understand why do we need to learn it?
Do these corollaries have some physical significance?

(a)$$\iiint_V(\nabla T)d^3 x=\oint_S T d\vec a$$
here S is the surface bounding the volume V .
(b)$$\iiint_V(\nabla \times\vec v)d^3 x= -\oint_S\vec v\times d\vec a$$,where S is the surface bounding the volume V .

(c)$$\iint_S(\nabla T)\times d\vec a =-\oint_P T d\vec l$$ , where P is the boundary of the surface S.
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It's sometimes useful in formulating integral laws in fluid dynamics. Be careful with these formulae. They are really safe only when used in Cartesian coordinates!
 
o.k.
Thank you.
 
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