半はん群ぐん

noun

semigroup

A mathematical term for a set equipped with an associative binary operation. Used in algebra and theoretical computer science.

• 自し然ぜん数すう全ぜん体たいの集しゅう合ごうは、加か法ほうに関かんして半はん群ぐんをなす。

  The set of all natural numbers forms a semigroup under addition.