that the only simply connected, closed 3-dimensional manifold is a sphere.

listen to the pronunciation of that the only simply connected, closed 3-dimensional manifold is a sphere.
Английский Язык - Английский Язык

Определение that the only simply connected, closed 3-dimensional manifold is a sphere. в Английский Язык Английский Язык словарь

That the only simply connected, closed 3-dimensional manifold is a sphere.
Poincaré conjecture