Structure (category theory)

In mathematics, progress often consists of recognising the same structure in different contexts - so that one method exploiting it has multiple applications. In fact this is a normal way of proceeding; in the absence of recognisable structure (which might be hidden) problems tend to fall into the combinatorics classification of matters requiring special arguments.

In category theory structure is discussed implicitly - as opposed to the explicit discussion typical with the many algebraic structures. Starting with a given class of algebraic structure, such as groups, one can build the category in which the objects are groups and the morphisms are group homomorphisms: that is, of structures on one type, and mappings respecting that structure. Starting with a category C given abstractly, the challenge is to infer what structure it is on the objects that the morphisms 'preserve'.

The term structure was much used in connection with the Bourbaki group's approach. There is even a definition. Structure must definitely include topological space as well as the standard abstract algebra notions. Structure in this sense is probably commensurate with the idea of concrete category that can be presented in a definite way - the topological case means that infinitary operations will be needed. Presentation of a category (analogously to presentation of a group) can in fact be approached in a number of ways, the category structure not being (quite) an algebraic structure in its own right.

Structure (disambiguation)

The structure of a thing is how the parts of it relate to each other, how it is "assembled".

Structure may also refer to:

In architecture:

In engineering:

In art:

In biology:

In chemistry:

Structural engineering

Structural engineers are most commonly involved in nonbuilding structures, as well as building structures, but they can also be involved in the design of machinery, medical equipment, vehicles or any item where structural integrity affects the item's function or safety. Structural engineers must ensure their designs satisfy given design criteria, predicated on safety (i.e. structures must not collapse without due warning) or serviceability and performance (i.e. building sway must not cause discomfort to the occupants).

Structural engineering theory is based upon applied physical laws and empirical knowledge of the structural performance of different materials and geometries. Structural engineering design utilizes a number of simple structural elements to build complex structural systems. Structural engineers are responsible for making creative and efficient use of funds, structural elements and materials to achieve these goals.

Structural Engineer (Professional)

Structural engineers are responsible for engineering design and analysis. Entry-level structural engineers may design the individual structural elements of a structure, for example the beams, columns, and floors of a building. More experienced engineers may be responsible for the structural design and integrity of an entire system, such as a building.

.org

The domain name org is a generic top-level domain (gTLD) of the Domain Name System (DNS) used in the Internet. The name is truncated from organization. It was one of the original domains established in 1985, and has been operated by the Public Interest Registry since 2003. The domain was originally intended for non-profit entities, but this restriction was not enforced and has been removed. The domain is commonly used by schools, open-source projects, and communities, as well as by for-profit entities. The number of registered domains in org has increased from fewer than one million in the 1990s, to ten million as of June, 2012.

History

The domain org was one of the original top-level domains, with com, us, edu, gov, mil and net, established in January 1985. It was originally intended for non-profit organizations or organizations of a non-commercial character that did not meet the requirements for other gTLDs. The MITRE Corporation was the first group to register an org domain with mitre.org in July 1985. The TLD has been operated since January 1, 2003 by Public Interest Registry, who assumed the task from VeriSign Global Registry Services, a division of Verisign.

List of Power Rangers Wild Force characters

Power Rangers Wild Force is the 2002 Power Rangers season that tells the story of the Wild Force Power Rangers and their fight against the polluting Orgs.

Wild Force Power Rangers

The Wild Force Rangers are granted mystical powers and charged to protect the Earth from pollution-created creatures called Orgs. More specifically, they defend the fictional city of Turtle Cove, and are stationed aboard a flying island called the Animarium. Their mentor is Princess Shayla, and her mentor is Animus (who is an ancient Megazord). The Rangers represent the Ancient Animarium Warriors who also fought to destroy the Orgs and save the Earth.

The Rangers morph using devices known as Growl Phones (which have three operating modes: normal, human-form, and Power Animal Mode that resembles an animal). Each Ranger is also armed with a Crystal Saber (into which an Animal Crystal is inserted to call a Wild Zord). In addition to piloting their Zords (known as Wild Zords), the Rangers pilot other vehicles, known as the Soul Bird and the Savage Cycles. When the Rangers put their weapons together they create the Jungle Sword, which can be used by the Red Ranger to defeat certain enemies.

Eva and Franco Mattes

Eva and Franco Mattes (both born in Italy in 1976) are a duo of artists based in New York. Neither of them received an art education, and since meeting in Madrid in 1994, they have never separated. Operating under the pseudonym 0100101110101101.org, they are counted among the second wave of the Internet artists, after Net.art, and are renowned for their subversion of public media. They are based in Brooklyn, New York, but also travel frequently throughout Europe and the United States.

Activity

In 2012, they received a visit from Hans Bernhard of Ubermorgen. From 1995–97, the Mattes toured the world’s most important museums and stole dozens of fragments from well-known works by artists such as Duchamp, Kandinsky, Beuys, and Rauschenberg. This work, titled "Stolen Pieces," exhibited the stolen fragments in glass cabinets: a porcelain piece of Duchamp's urinal, skin from an Alberto Burri painting, etc. They have manipulated video games, internet technologies and street advertising to reveal truths concealed by contemporary society. Their media facades were believable enough to elicit embarrassing reactions from governments, the public, and the art world. In addition, they have orchestrated several unpredictable mass performances, staged outside art spaces, and involved unwitting audiences in scenarios that mingle truth and falsehood to the point of being indistinguishable. Their off-the-wall performances—for which they have been sued multiple times—include affixing fake architectural heritage plaques (An Ordinary Building, 2006), rolling out a media campaign for a non-existent action movie (United We Stand, 2005) and even convincing the people of Vienna that Nike had purchased the city’s historic Karlsplatz and was about to rename it “Nikeplatz” (Nike Ground, 2003).