Operators that follow this property are known as hull operators and must be extensive, non-decreasing, and idempotent.
Operators that follow this property are known as hull operators and must be extensive, non-decreasing, and idempotent. Sets with this property must contain all of their limit points, or boundary points. The operation subtraction follows this property for real numbers but not for positive real numbers. The square root function does not have this property for rational numbers because some of its outputs are irrational or imaginary. Name this property requiring an operation to give a result taken from the same set as its inputs.
Operators that follow this property are known as hull operators and must be extensive, non-decreasing, and idempotent.
(topological or algebraic) {closure} [accept closed]