첫댓글 원소가 하나인 집합 아닌가여?
A set having exactly one element a. A singleton set is denoted by {a} and is the simplest example of a nonempty set.
첫댓글 원소가 하나인 집합 아닌가여?
A set having exactly one element a. A singleton set is denoted by {a} and is the simplest example of a nonempty set.