Definition:Interior Point


 * Topology and metric spaces:
 * An Interior point of a subset $H$ of a topological space: A point of the interior of $H$.
 * An interior point of a subspace $H$ of a metric space: A point which has an open ball completely contained in $H$.
 * An interior point of a subset $H$ of the complex plane $\C$: A complex number which has a neighborhood completely contained in $H$.


 * Geometry:
 * An interior point of a region is one of the points intuitively understood as being inside the region.