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The pullback bundle is an example that bridges the notion of a pullback as precomposition, and the notion of a pullback as a Cartesian square. In that example, the base space of a fiber bundle is pulled back, in the sense of precomposition, above. The fibers then travel along with the points in the base space at which they are anchored: the ...
Muckraker. McClure's (cover, January 1901) published many early muckraker articles. The muckrakers were reform-minded journalists, writers, and photographers in the Progressive Era in the United States (1890sā1920s) who claimed to expose corruption and wrongdoing in established institutions, often through sensationalist publications.
Pullback (category theory) In category theory, a branch of mathematics, a pullback (also called a fiber product, fibre product, fibered product or Cartesian square) is the limit of a diagram consisting of two morphisms f : X ā Z and g : Y ā Z with a common codomain. The pullback is written.
A Kelbly rifle action bolt that has been oiled to run smoothly. A US Marine extracts a fired cartridge from an M40A3 using a bolt-action mechanism. Bolt-action is a type of manual firearm action that is operated by directly manipulating the bolt via a bolt handle, most commonly placed on the right-hand side of the firearm (as most users are ...
The Twelfth Amendment to the United States Constitution takes effect, June 15, 1804. Battle of Sitka, October 1804. The Territory of Orleans is organized and the District of Louisiana is created, October 1, 1804. The Territory of Michigan is organized, June 30, 1805.
The urbanization of the United States occurred over a period of many years, with the nation only attaining urban-majority status between 1910 and 1920. [2] Currently, over four-fifths of the U.S. population resides in urban areas, a percentage which is still increasing today. [2] The United States Census Bureau changed its classification and ...
Pullback (differential geometry) This article is about pullback operations in differential geometry, in particular, the pullback of differential forms and tensor fields on smooth manifolds. For other uses of the term in mathematics, see pullback. Let be a smooth map between smooth manifolds and . Then there is an associated linear map from the ...
Retractor (medicine) A retractor is a surgical instrument used to separate the edges of a surgical incision / wound or to hold away certain organs and tissues (i.e. to provide tissue retraction) so that body parts underneath may be accessed during surgical operations. [1]