Recent content by julian

  1. J

    How do you switch language from German to English with 8.1 knoppix usb

    I did a google search and the first few hits I clicked on weren't helpful and that led me to prematurely abandon my efforts. Upon further investigation I've now found all you have to do is type in "knoppix lang=uk" at the boot prompt stage. Thanks.
  2. J

    How do you switch language from German to English with 8.1 knoppix usb

    Hello I'm booting from 8.1 Knoppix usb and want to switch the language settings from German to UK English but don't know how. Thanks
  3. J

    I Diagrammatic tensor notation?

    In the preface of Volume 1: Two-Spinor Calculus and Relativistic Fields Roger Penrose, Wolfgang Rindler Penrose/Rindler say Given the diagrammatic notation was, it seems, intended for private calculations it may be difficult answering the question if anybody else uses it.
  4. J

    Solve integral by finding Fourier series of complex function

    Yes, that is how you obtain the Fourier coefficients. I was thinking \begin{align*} c_0 = \frac{1}{2 \pi} \int_{-\pi}^\pi \dfrac{r - \cos x}{r^2 - 2 r \cos x + 1} dx \end{align*} so you can't know the value of the integral you are after (##\int_{-\pi}^\pi \dfrac{1}{r^2 - 2 r \cos x + 1} dx##)...
  5. J

    Solve integral by finding Fourier series of complex function

    Try the function \begin{align*} v(x) = A + u(x) e^{ix} \end{align*} where ##A## is an appropriately chosen constant. You only need the real part of the function.
  6. J

    A question regarding continuous function on a closed interval

    I think you would apply the Intermediate Value Theorem in this context. It states: If ##f## is a continuous function whose domain contains the interval ##[c, b]##, then it takes on any given value between ##f(c)## and ##f(b)## at some point within the interval.
  7. J

    If murdered, which fictional TV detective do you want on the case?

    If you happen to be a cartoon that has been murdered, there is the remarkably similar looking inspector John Gadget. Though it would be his niece Penny and his dog brain who would actually solve the murder. Although, to be honest, I don't recall there being a multitude of murders in the programme.
  8. J

    If murdered, which fictional TV detective do you want on the case?

    Then there is inspector Jacques Clouseau. Though being a bumbling and inept police detective, he would end up successfully solving the case by sheer luck.
  9. J

    If murdered, which fictional TV detective do you want on the case?

    Talking of John Thaw, there is the brilliant Detective Chief Inspector Morse. Inspector Morse was a detective with the Oxford City Police, known for his intellectual acumen, love of classical music, taste for the finer things, and his fondness for real ale. Morse often solved complex murder...
  10. J

    I Rewriting Equation of Motion in terms of Dual Fields (Chern-Simons)

    I think I answered this question a while ago. See: https://www.physicsforums.com/threads/maxwell-chern-simons-action.780013/ In particular post #6.
  11. J

    POTW Inequality of Determinants

    Yep. It is possible to diagonalize a real symmetric matrix by a real orthogonal similarity transformation. If ##U^T M_S U = D##, then ##M_S = UDU^T = (UD^{1/2}U^T) (U D^{1/2}U^T) = M_S^{1/2} M_S^{1/2}##.
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