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ν_{m n} = c R (1 / m^{2} - 1 / n^{2}), (n = m + 1, m + 2, m + 3, \dots)

${\nu_{mn} = cR(1/m^2 – 1/n^2) , (n = m + 1, m + 2, m + 3, …)}$

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