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  2. ∂ - Wikipedia

    en.wikipedia.org/wiki/%E2%88%82

    The boundary of a set in topology. The boundary operator on a chain complex in homological algebra. The boundary operator of a differential graded algebra. The conjugate of the Dolbeault operator on complex differential forms. The boundary ∂(S) of a set of vertices S in a graph is the set of edges leaving S, which defines a cut.

  3. Divergent boundary - Wikipedia

    en.wikipedia.org/wiki/Divergent_boundary

    Continental-continental divergent/constructive boundary Oceanic divergent boundary: mid-ocean ridge (cross-section/cut-away view). In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.

  4. Border - Wikipedia

    en.wikipedia.org/wiki/Border

    A relic border is a former boundary, which may no longer be a legal boundary at all. However, the former presence of the boundary can still be seen in the landscape. For instance, the boundary between East and West Germany is no longer an international boundary, but it can still be seen because of historical markers on the landscape; it remains ...

  5. Boundaries between the continents - Wikipedia

    en.wikipedia.org/wiki/Boundaries_between_the...

    Throughout the Middle Ages and into the 18th century, the traditional division of the landmass of Eurasia into two continents, Asia and Europe, followed Ptolemy, with the boundary following the Turkish Straits, the Black Sea, the Kerch Strait, the Sea of Azov and the Don (known in antiquity as the Tanais).

  6. Boundary - Wikipedia

    en.wikipedia.org/wiki/Boundary

    MV Boundary, a number of ships with this name; Boundaries in landscape history, the divide between areas of differing land used; Boundary (real estate), the legal boundary between units of real property; Boundary (company), an American application performance management company; Boundary critique, a concept about the meaning and validity of ...

  7. Mohorovičić discontinuity - Wikipedia

    en.wikipedia.org/wiki/Mohorovičić_discontinuity

    Earth's crust and mantle, Moho discontinuity between bottom of crust and solid uppermost mantle. The Mohorovičić discontinuity (/ ˌ m oʊ h ə ˈ r oʊ v ɪ tʃ ɪ tʃ / MOH-hə-ROH-vih-chitch; Croatian: [moxorôʋiːtʃitɕ]) [1] – usually called the Moho discontinuity, Moho boundary, or just Moho – is the boundary between the crust and the mantle of Earth.

  8. Boundary (topology) - Wikipedia

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

    A boundary point of a set is any element of that set's boundary. The boundary defined above is sometimes called the set's topological boundary to distinguish it from other similarly named notions such as the boundary of a manifold with boundary or the boundary of a manifold with corners, to name just a few examples.

  9. Metes and bounds - Wikipedia

    en.wikipedia.org/wiki/Metes_and_bounds

    Metes and bounds is a system or method of describing land, real property (in contrast to personal property) or real estate. [1] The system has been used in England for many centuries and is still used there in the definition of general boundaries.