# Category:Set Closures

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This category contains results about Set Closures in the context of Topology.

Definitions specific to this category can be found in Definitions/Set Closures.

The **closure of $H$ (in $T$)** is defined as:

- $H^- := H \cup H'$

where $H'$ is the derived set of $H$.

## Subcategories

This category has the following 7 subcategories, out of 7 total.

### K

### S

## Pages in category "Set Closures"

The following 69 pages are in this category, out of 69 total.

### C

- Characterization of Closure by Basis
- Characterization of Closure by Open Sets
- Closure Equals Union with Derivative
- Closure in Subspace
- Closure of Connected Set is Connected
- Closure of Dense-in-itself is Dense-in-itself in T1 Space
- Closure of Derivative is Derivative in T1 Space
- Closure of Empty Set is Empty Set
- Closure of Finite Union equals Union of Closures
- Closure of Half-Open Real Interval is Closed Real Interval
- Closure of Infinite Subset of Finite Complement Space
- Closure of Infinite Union may not equal Union of Closures
- Closure of Integer Reciprocal Space
- Closure of Interior of Closure of Union of Adjacent Open Intervals
- Closure of Intersection is Subset of Intersection of Closures
- Closure of Intersection may not equal Intersection of Closures
- Closure of Intersection of Rationals and Irrationals is Empty Set
- Closure of Irrational Interval is Closed Real Interval
- Closure of Irrational Numbers is Real Numbers
- Closure of Open Real Interval is Closed Real Interval
- Closure of Open Set of Closed Extension Space
- Closure of Open Set of Particular Point Space
- Closure of Rational Numbers is Real Numbers
- Closure of Real Interval is Closed Real Interval
- Closure of Set of Condensation Points equals Itself
- Closure of Subset of Closed Set of Metric Space is Subset
- Closure of Subset of Indiscrete Space
- Closure of Subset of Metric Space is Intersection of Closed Supersets
- Closure of Topological Closure equals Closure
- Closure of Union contains Union of Closures
- Closure of Union of Adjacent Open Intervals
- Complement of Closure is Interior of Complement
- Complement of Interior equals Closure of Complement
- Condition for Point being in Closure
- Continuity Defined by Closure

### D

### E

### I

### K

- Kuratowski's Closure-Complement Problem
- Kuratowski's Closure-Complement Problem/Closure
- Kuratowski's Closure-Complement Problem/Closure of Interior
- Kuratowski's Closure-Complement Problem/Closure of Interior of Closure
- Kuratowski's Closure-Complement Problem/Closure of Interior of Complement
- Kuratowski's Closure-Complement Problem/Interior of Closure
- Kuratowski's Closure-Complement Problem/Interior of Closure of Interior
- Kuratowski's Closure-Complement Problem/Proof of Maximum

### N

### S

- Set between Connected Set and Closure is Connected
- Set Closure as Intersection of Closed Sets
- Set Closure is Smallest Closed Set
- Set is Closed iff Equals Topological Closure
- Set is Subset of its Topological Closure
- Subset of Metric Space is Subset of its Closure
- Supremum of Bounded Above Set of Reals is in Closure