👉 In mathematics, an "unset" is a term used to refer to a set that contains no elements. Unsets are often encountered in various mathematical contexts such as in logic and set theory, where they represent empty sets or sets of undefined or unspecified elements. For example: - The empty set { } is an unset because it does not contain any element. - The set N of natural numbers (denoted by "N") is an unset because it contains no elements other than the
