I am thinking of this Norton's dome.
The author guesses a solution,
$$ r(t)=\left\{ \begin{array}{c l} \frac{1}{144}(t-T)^4 & ,t\geq T\\ 0 & ,t\leq T \end{array}\right. $$
for this second order of differential equation
$$\ddot{r}=r^{\frac{1}{2}}$$
with $r(0)=0, \dot{r}(0)=0$
and then argue that classical mechanics does not have to be deterministic, given $T$ can be any number we want (as long as greater than zero).
I have a background of physics major, and understand (somewhat by this argument) that determinism as an assumption in classical physics - that we have to assume the conditions of uniqueness theorem always exist in nature for classical physics - but I would like a complete understanding of this topic, and hence I would like to ask,
Does the solution exist? Does the author's argument stands in an rigorous mathematical standing point?