# In what sense is ''Oppenheimer-Snyder collapse a time reversed closed FRW model"?

In what sense is ''Oppenheimer-Snyder collapse a time reversed closed FRW model" ?

That is, "Are closed FRW metric (k=1) and the geometry inside the collapsing homogeneous matter same?" If yes, how?

(FRW metric: $ds^2= -dt^2 + \frac{a^2(t)}{1-r^2}dr^2 + a^2r^2d\Omega^2$

OS metric: $ds^2= -e^\nu dt^2 + e^\lambda dr^2 + r^2d\Omega^2$

It would be nice, if some rigorous mathematical arguments are provided.)