Einstein's famous mass-energy equivalence is also a Pythagorean relationpic.twitter.com/JtXG4VipBD
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When you Taylor-expand E = sqrt(m^2 c^4 + p^2 c^2) you get E = mc^2 + p^2 / 2m + ... Maybe this 1/2 is what
@mathematicsprof was talking about? It shows up automatically - no need to stick it in by hand.
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That's how to intimidate 'em: in a conversation where nobody has mentioned the letter beta, knowingly mutter "small beta expansion".
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