Brieskorn manifold

In mathematics, a Brieskorn manifold or Brieskorn–Phạm manifold, introduced by, is the intersection of a small sphere around the origin with the singular, complex hypersurface
 * $$x_1^{k_1}+\cdots+x_n^{k_n}=0$$

studied by.

Brieskorn manifolds give examples of exotic spheres.