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<math>
<math>
L_n = \sum_i^h l_iN_i \sim \sum_i^h b^{2i/3} = \frac{1-b^{2h/3}}{1-b^{2/3}} = \approx b^{2h/3 } = N^{2/3}
L_n = \sum_i^h l_iN_i \sim \sum_i^h b^{2i/3} = \frac{1-b^{2h/3}}{1-b^{2/3}} = \approx b^{2h/3 } = N^{\frac{2}{3}}
</math>
</math>