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julian's latest activity
J
julian
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Help with Time-Independent Perturbation Theory "Good" States Proof
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To show that ##\psi_a^0## and ##\psi_b^0## span the space, we must prove they are linearly independent. Suppose \begin{align*} \kappa...
Oct 16, 2025
J
julian
replied to the thread
Help with Time-Independent Perturbation Theory "Good" States Proof
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If ##\gamma = \mu##, then you don’t necessarily have ##\langle \psi_a^0 , \psi_\gamma (0) \rangle = 0##.
Oct 15, 2025
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julian
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Collection of Lame Jokes
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Aug 10, 2025
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julian
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Collection of Lame Jokes
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Aug 9, 2025
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Collection of Lame Jokes
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Aug 9, 2025
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Collection of Lame Jokes
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Aug 9, 2025
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Error in Landau-Lifshitz Vol 2, equation (2), page 277
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In the 4th edition (1975), the relevant page is 257, not 277. I believe I was able to derive the equation for ##D_{\alpha}## in (2) by...
Aug 5, 2025
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julian
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Error in Landau-Lifshitz Vol 2, equation (2), page 277
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I think this is the fourth edition: https://archive.org/details/landau-l.-d.-lifshitz-e.-m.-course-of-theoretical-vol-2/page/n3/mode/2up
Aug 5, 2025
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Physicists disagree wildly on what quantum mechanics says about real…
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I thought it would be informative to post the full chart from the article:
Aug 3, 2025
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Uncertainties in the proof of Proposition 4.4.2 in Hawking and Ellis
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Thank you so much, I will study these notes further.
Jul 31, 2025
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