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**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".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**.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.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.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**.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:Get breaking news and the latest headlines on business, entertainment, politics, world news, tech, sports, videos and much more from

**AOL**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 ...