Consider the following subset of $\mathbb{R}^2$:
$S = \{ (x, y) \in \mathbb{R}^2 : |y| \leq |x|^{3/2} \}$
(See here for a plot on Wolfram Alpha.)
The origin $(0, 0)$ is a kind of singular point of $S$.
Question: Does there exist a $C^2$ map $\varphi \colon M \to \mathbb{R}^2$ on some manifold $M$ such that $\varphi(M) = S$?
Further context:
- I would like for $M$ to be finite dimensional.
- Ideas of techniques to construct or disprove the existence of such $\varphi$ are welcome.
- It is satisfactory if the image of $\varphi$ is locally the same as $S$ around the origin.
- The set $S' = \{ (x, y) : y^2 \leq x^3 \}$ is the right-half of $S$; it admits a smooth lift: $\varphi(s, t) = (s^2, s^3 \sin(t))$.