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What is your favorite equation?

  1. Dec 1, 2009 #1
    It can be about anything. I am kind of new to physics and I love playing with new interesting equations like time dilation and so forth. Whats your favorite equation that you use to calculate things for fun?
  2. jcsd
  3. Dec 1, 2009 #2
    electromagnetism: d(*+i)dA = -*J
  4. Dec 1, 2009 #3
    Lagrange's equations

    [tex]\frac{d}{dt}\frac{\partial L}{\partial\dot{q}} -\frac{\partial L}{\partial q}=0[/tex]
  5. Dec 2, 2009 #4
    The set of equations as in the attached PDF.

    Attached Files:

  6. Dec 2, 2009 #5


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    Staff Emeritus
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    Gold Member

    Am I allowed two interrelated equations? If so, I'll have Maxwell's equations

    [tex]F_{\left[\alpha\beta,\gamma\right]} = 0[/tex]

    [tex]{F^{\alpha\beta}}_{;\beta} = \mu_0J^\alpha[/tex]
  7. Dec 2, 2009 #6
    Maxwell eqs.
  8. Dec 2, 2009 #7
    The symmetrization requirement in QM:

    \psi(\textbf{r}_1,\textbf{r}_2) = \pm \psi(\textbf{r}_2,\textbf{r}_1)
    [/tex] (+for bosons, - for fermions)
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