How to Prove the Identity ∇×(u×v)=v∙∇u-u∙∇v+u∇∙v-v ∇∙u?

In summary, the conversation discusses how to go about proving the identity: ∇×(u×v)=v∙∇u-u∙∇v+u∇∙v-v ∇∙u, where v and u are vectors. The suggested method is to expand the del operator and apply it to the first and second vectors, as well as considering different forms of vectors in the (i,j,k) notation. It is also important to check the scalar and vector forms using the dot and cross products. Additionally, it is suggested to refer to a good book for further guidance.
  • #1
oxxiissiixxo
27
0
Can any show me how you will go about proofing this identity

∇×(u×v)=v∙∇u-u∙∇v+u∇∙v-v ∇∙u where v and u are vectors

Many thanks.
 
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  • #2
IT IS VECTOR TRIPLE PRODUCT EXPANSION

SIMPLY SOLVE IT BY EXPANDING DEL
AND APPLY IT TO FIRST VECTOR AND TAKING SECOND(VECTOR) CONSTANT AND THEN VICE VERSA.

U SHOULD ALSO ASSUME GENERAL DIFFIRENT FORMS OF VECTORS IN (I,J,K).

U SHOULD ALSO CHECK THE SCALAR AND VECTOR FORMS ,i.e,"X" & "." IS APPLIED B/W TWO VECTORS(WHICH GIVE AGAIN A VECTOR & SCALAR RESP.)

OR U SHOULD PREFER A GOOD BOOK.
 
  • #3
Gobind, thank you for your post but please take off your Caps lock!

oxxiissiixxo, as Gobind says, the simplest way to prove that is probably to go ahead and doing the calculations. Tedious but not difficult.
 

1. What is vector calculus?

Vector calculus is a branch of mathematics that deals with the study of vector fields, which are functions that assign a vector to each point in space. It includes topics such as differentiation and integration of vector fields, line and surface integrals, and the theorems of Green, Stokes, and Gauss.

2. What is the difference between scalar and vector fields?

A scalar field is a function that assigns a scalar value, such as temperature or pressure, to each point in space. On the other hand, a vector field assigns a vector, which has both magnitude and direction, to each point in space.

3. Why is vector calculus important?

Vector calculus is important because it provides a powerful mathematical framework for describing and analyzing physical phenomena that involve quantities with both magnitude and direction. This includes fields such as fluid dynamics, electromagnetism, and general relativity.

4. What are some common applications of vector calculus?

Vector calculus has numerous applications in physics, engineering, and other fields. Some common applications include determining the flow of fluids, calculating the force on an object due to an electromagnetic field, and analyzing the curvature of space-time in general relativity.

5. What are some key theorems in vector calculus?

Some important theorems in vector calculus include the gradient, divergence, and curl theorems, which relate the operations of gradient, divergence, and curl to line, surface, and volume integrals respectively. The theorems of Green, Stokes, and Gauss are also fundamental in vector calculus, providing relationships between surface and volume integrals and the behavior of vector fields within these regions.

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