被ひ覆ふく空くう間かん

noun

covering space

A topological concept: a space that maps onto another space such that each point has a neighborhood whose preimage is a disjoint union of homeomorphic copies. Used in algebraic topology and related fields.

• 被ひ覆ふく空くう間かんの理り論ろんは基き本ほん群ぐんの研けん究きゅうで重じゅう要ようである。

  The theory of covering spaces is important in the study of fundamental groups.

• 円えん周しゅうの普ふ遍へん被ひ覆ふく空くう間かんは実じっ数すう直ちょく線せんである。

  The universal covering space of the circle is the real line.