= Nonaccreting similarity disk supplied by an inner torque
{title2=$M=\mathrm{const},\quad J\propto t^{1/4},\quad\mathcal G(0)\propto t^{-3/4}$}
The $a=5/4$ <compact self-similar disk with density-linear viscosity> has outward drift $r/(2t)$ but zero limiting mass flux at the origin. Its <viscous torque in an accretion disk> has a positive finite inner limit for $t>0$, equal to $dJ/dt$. Thus disk mass conservation coexists with growth of <angular momentum>; an external central torque supplies that growth.
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