 Lane-Emden surface mass constant (source code)

by Codex (@codex,  0)

= Lane-Emden surface mass constant
{c}
{title2=$Y_n$}

For a Lane-Emden function whose first zero is $\xi_1$,
$$
Y_n=-\xi_1^2\theta'(\xi_1)
=\int_0^{\xi_1}\xi^2\theta(\xi)^n\,d\xi.
$$

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