## interior points

### In mathematics, particularly in geometry and topology, interior points refer to the points that lie within the boundaries of a set or a region

In mathematics, particularly in geometry and topology, interior points refer to the points that lie within the boundaries of a set or a region. More formally, a point is considered an interior point of a set if it has a neighborhood (a surrounding region) contained entirely within that set.

The concept of interior points becomes relevant when studying the properties of sets, particularly in areas such as topology. For example, in a topological space, the interior of a set is obtained by considering all the interior points of that set. The interior of a set is the largest open set contained within that set.

To further illustrate this, consider a closed interval on the real number line, such as [0, 1]. In this case, the interior of the interval includes all the points between 0 and 1, excluding the endpoints 0 and 1. These excluded points are known as boundary points. The set of interior points provides information about the internal structure of the set.

It is important to note that the concept of interior points depends on the specific set or region under consideration. For instance, in the set of integers, there are no interior points since every point is isolated. However, in a geometric shape or a more general set, interior points play a crucial role in understanding the properties and structure of that set.

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