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> m_mu / m_e = 206.768... phi^4 = 206.765...

> m_tau / m_mu = 16.817... phi^3 = 16.817...

> [...]

> Where did I go wrong?

If phi is the Golden ratio (1+sqrt(5))/2, then

- phi^4 is about 6.8541019662496845446137605

- phi^3 is about 4.23606797749978969640917366873127623544

--

Addendum: the only numerical coincidence that I am aware of concerning the masses of the electron, muon and tau is the Koide formula:

> https://en.wikipedia.org/wiki/Koide_formula

which says

(m_e + m_mu + m_tau)/(sqrt(m_e) + sqrt(m_mu) + sqrt(m_tau))^2 ≈ 2/3.

This is a numerical coincidence that physics cannot yet explain.



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