= Marginal fragmentation wavelength of a rotating sheet
{title2=$\ell_{\mathrm{crit}}=\pi^2G\Sigma_0/(2\Omega^2)$}
At fixed $\Sigma_0,\Omega\ne0$, slowly decreasing $c$ first reaches a zero of the wave-frequency minimum at $c=\pi G\Sigma_0/(2|\Omega|)$. The corresponding <wavelength> is $\ell=\pi^2G\Sigma_0/(2\Omega^2)$. It estimates the spacing and scale of growing density concentrations just below marginality; linear theory does not determine the final nonlinear clump radius.
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