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  2. Interior (topology) - Wikipedia

    en.wikipedia.org/wiki/Interior_(topology)

    The point x is an interior point of S. The point y is on the boundary of S. In mathematics, specifically in topology, the interior of a subset S of a topological space X is the union of all subsets of S that are open in X. A point that is in the interior of S is an interior point of S. The interior of S is the complement of the closure of the ...

  3. DE-9IM - Wikipedia

    en.wikipedia.org/wiki/DE-9IM

    where ⁠ ⁠ is the dimension of the intersection (∩) of the interior (I), boundary (B), and exterior (E) of geometries a and b.. The terms interior and boundary in this article are used in the sense used in algebraic topology and manifold theory, not in the sense used in general topology: for example, the interior of a line segment is the line segment without its endpoints, and its ...

  4. Boundary (topology) - Wikipedia

    en.wikipedia.org/wiki/Boundary_(topology)

    The interior of the boundary of a closed set is empty. [proof 1] Consequently, the interior of the boundary of the closure of a set is empty. The interior of the boundary of an open set is also empty. [proof 2] Consequently, the interior of the boundary of the interior of a set

  5. Jordan curve theorem - Wikipedia

    en.wikipedia.org/wiki/Jordan_curve_theorem

    If X is an n-dimensional compact connected submanifold of R n+1 (or S n+1) without boundary, its complement has 2 connected components. There is a strengthening of the Jordan curve theorem, called the Jordan–Schönflies theorem , which states that the interior and the exterior planar regions determined by a Jordan curve in R 2 are ...

  6. Relative interior - Wikipedia

    en.wikipedia.org/wiki/Relative_interior

    Formally, the relative interior of a set (denoted ⁡ ()) is defined as its interior within the affine hull of . [1] In other words, ⁡ ():= {: > ⁡ ()}, where ⁡ is the affine hull of , and () is a ball of radius centered on . Any metric can be used for the construction of the ball; all metrics define the same set as the relative interior.

  7. Interior-point method - Wikipedia

    en.wikipedia.org/wiki/Interior-point_method

    An interior point method was discovered by Soviet mathematician I. I. Dikin in 1967. [1] The method was reinvented in the U.S. in the mid-1980s. In 1984, Narendra Karmarkar developed a method for linear programming called Karmarkar's algorithm, [2] which runs in provably polynomial time (() operations on L-bit numbers, where n is the number of variables and constants), and is also very ...

  8. Domain (mathematical analysis) - Wikipedia

    en.wikipedia.org/wiki/Domain_(mathematical_analysis)

    An open set is connected if it cannot be expressed as the sum of two open sets. An open connected set is called a domain. German: Eine offene Punktmenge heißt zusammenhängend, wenn man sie nicht als Summe von zwei offenen Punktmengen darstellen kann. Eine offene zusammenhängende Punktmenge heißt ein Gebiet.

  9. Kruskal–Szekeres coordinates - Wikipedia

    en.wikipedia.org/wiki/Kruskal–Szekeres_coordinates

    The quadrants are the black hole interior (II), the white hole interior (IV) and the two exterior regions (I and III). The dotted 45° lines, which separate these four regions, are the event horizons. The darker hyperbolas which bound the top and bottom of the diagram are the physical singularities.

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