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  1. R

    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. R

    Tensor product

    Could someone tell me what the tensor product is and give an example?
  3. R

    Why c in a vacuum?

    Oh ok i get it now. darn I'm stupid.
  4. R

    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. R

    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. R

    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. R

    Invariance of the interval

    How do we prove that the spacetime interval is invariant? Also why is it so important?
  8. R

    Principle of least action

    I suppose. Yes I can.
  9. R

    Good quantum mechanics intro

    Are there any good online quantum mechanics intros?
  10. R

    Principle of least action

    Could someone explain why the principle of least action is true?
  11. R

    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. R

    Metric tensor

    How do we derive the metric tensor?
  13. R

    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. R

    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. R

    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. R

    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. R

    Poincare conjecture.

    What is the poincare conjecture in layman's terms?
  18. R

    Good differential geometry book

    What i meant was, does it present the intuition behind every theorem or a t least the major ones.
  19. R

    Good differential geometry book

    Is riemannian geometry by sylvestre gallot good?
  20. R

    Good differential geometry book

    Why would it be wrong to chose those?
  21. R

    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. R

    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.
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