# Search results

1. ### Maximize the flux

Given a vector field (4x+2x^3z)i-y(x^2 +y^2)j -(3x^2z^2 +4y^2z)k which closed surface has the greatest flux. I imagine that the divergence theorem palys a role but I'm not sure. please anwer ! This is killing me!
2. ### Tensor product

Could someone tell me what the tensor product is and give an example?
3. ### Why c in a vacuum?

Oh ok i get it now. darn I'm stupid.
4. ### Why c in a vacuum?

but why do they still apply? is it because of the postulate that says that all the laws of physics are the same in all inertial frames?
5. ### Why c in a vacuum?

THen wouldn't that mean that time dilation and therefore all relativistic effects only apply in vacuum? i mean since the speed of light is not the same to all observers in non vacuum.
6. ### Why c in a vacuum?

Why is the c in the the time dilation formula have the be the speed of light in a vacuum and not the one in the medium through which an observer sees it move? Say for example we do that thought experiment used to derive the formula, in a much denser medium(in which the speed of light is...
7. ### Invariance of the interval

How do we prove that the spacetime interval is invariant? Also why is it so important?
8. ### Principle of least action

I suppose. Yes I can.
9. ### Good quantum mechanics intro

Are there any good online quantum mechanics intros?
10. ### Principle of least action

Could someone explain why the principle of least action is true?
11. ### Derivation of gauss's law for electrical fields

This is a very stupid question. extremely stupid. In fact I'm extremely embarassed. I was reading a text on electromagnetism, and it said that since the flux due to a charge does not depend on the radius of the sphere then the formula, q/permitivitty applies to all closed surfaces. This is...
12. ### Metric tensor

How do we derive the metric tensor?
13. ### Schaum's outline

Is schaum's, tensor calculus outline a good introduction to the basics of the subject? I'm looking for something that isn't too formal and purely elementary.
14. ### A complete course in relativity.

So I've narrowed it down to sean caroll's and d'inverno's. How much do each cover?
15. ### A complete course in relativity.

I've read some of the mathematical portions of shcutuz and siliked it for it's lack of rigour.
16. ### A complete course in relativity.

I was wondering what book would be useful in learning special relativity and basic general relativity. I know vector calculus, multivariable calculus, and a bit of variational calculus. I'm looking for something that takes an informal approach to the underlying mathematics(but still rigorous)...
17. ### Poincare conjecture.

What is the poincare conjecture in layman's terms?
18. ### Good differential geometry book

What i meant was, does it present the intuition behind every theorem or a t least the major ones.
19. ### Good differential geometry book

Is riemannian geometry by sylvestre gallot good?
20. ### Good differential geometry book

Why would it be wrong to chose those?
21. ### Good differential geometry book

I'm looking for a good book on riemannian geometry, with a minimum of prerequistes and that takes a more intutive rather than formal approach. I know a bit of calculus of variations, multivariable calculus, vector calculus, and a bit of linear algebra.
22. ### Calculus of variations, book recommendations.

I need a good calculus of variations book. I would like something that is clear but not devoid of mathematical rigour.