単たん連れん結けつ空くう間かん

noun

simply-connected space

A topological space that is path-connected and has a trivial fundamental group; every loop can be continuously shrunk to a point.

• 球きゅう面めんは単たん連れん結けつ空くう間かんの一いち例れいである。

  A sphere is an example of a simply-connected space.

• トーラスは単たん連れん結けつ空くう間かんではない。

  A torus is not a simply-connected space.