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  2. Common pochard - Wikipedia

    The common pochard (/ ˈ p ɒ tʃ ər d /; Aythya ferina) is a medium-sized diving duck.The scientific name is derived from Greek aithuia, an unidentified seabird mentioned by authors including Hesychius and Aristotle, and Latin ferina, "wild game", from ferus, "wild".

  3. World map - Wikipedia

    A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the earth. While this is true of any map, these distortions reach extremes in a world map.

  4. Site map - Wikipedia

    A Sitemap is a list of pages of a web site within a domain.. There are three primary kinds of sitemap: Sitemaps used during the planning of a Web site by its designers.; Human-visible listings, typically hierarchical, of the pages on a site.

  5. Poincaré map - Wikipediaé_map

    In mathematics, particularly in dynamical systems, a first recurrence map or Poincaré map, named after Henri Poincaré, is the intersection of a periodic orbit in the state space of a continuous dynamical system with a certain lower-dimensional subspace, called the Poincaré section, transversal to the flow of the system.

  6. Locator map - Wikipedia

    In cartography, a locator map, or just a locator, is typically a simple map used to show the location of a particular geographic region within its larger and presumably more familiar context. Depending on the needs of the cartographer, this type of map can be used on its own or as an inset or addition to a larger map.

  7. Exponential map (Lie theory) - Wikipedia

    For example, the exponential map from (3) to SO(3) is not a local diffeomorphism; see also cut locus on this failure. See derivative of the exponential map for more information. Surjectivity of the exponential. In these important special cases, the exponential map is known to always be surjective:

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  9. Antilinear map - Wikipedia

    where this inner product makes ′ and ¯ ′ into Hilbert spaces. The inner products , ′ and , ¯ ′ are antilinear in their second arguments. Moreover, the canonical norm induced by this inner product (that is, the norm defined by , ′) is consistent with the dual norm (that is, as defined above by the supremum over the unit ball); explicitly, this means that the following holds for ...