http://netvouz.com/narky/tag/wiki?feed=rss&pg=1 narky's bookmarks tagged "wiki" on Netvouz http://en.wikipedia.org/wiki/Bijection In mathematics, a bijection, or a bijective function is a function f from a set X to a set Y with the property that, for every y in Y, there is exactly one x in X such that f(x) = y. Alternatively, f is bijective if it is a one-to-one correspondence between those sets; i.e., both one-to-one (injective) and onto (surjective).[1] (See also Bijection, injection and surjection.) Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups narky Mon, 30 Apr 2007 02:38:51 GMT http://en.wikipedia.org/wiki/Bijection%2C_injection_and_surjection In mathematics, injections, surjections and bijections are classes of functions distinguished by the manner in which arguments (input expressions from the domain) and images (output expressions from the codomain) are related or mapped to each other. Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups narky Tue, 01 May 2007 02:47:52 GMT http://en.wikipedia.org/wiki/Caffeine Caffeine (sometimes called guaranine when found in guarana, mateine when found in mate, and theine when found in tea) is a xanthine alkaloid found in the leaves and beans of the coffee tree, in tea, yerba mate, guarana berries, and in small quantities in cocoa, the kola nut and the Yaupon holly. In plants, caffeine acts as a natural pesticide that paralyzes and kills many insects feeding upon them. Lifestyle > Drugs narky Thu, 01 Jun 2006 06:46:24 GMT http://en.wikipedia.org/wiki/Cellar_Door Cellar door is a combination of words in the English language once characterized by J. R. R. Tolkien to have an especially beautiful sound. jelly > random narky Thu, 01 Jun 2006 09:51:17 GMT http://en.wikipedia.org/wiki/Dimethyltryptamine Dimethyltryptamine, also known as DMT and N,N-dimethyltryptamine, is a hallucinogenic tryptamine, similar in structure to the neurotransmitter serotonin. DMT is created in small amounts by the human body during normal metabolism. Pure DMT at room temperature is a colorless waxy or crystalline solid. DMT was first chemically synthesized in 1931. Lifestyle > Drugs narky Thu, 01 Jun 2006 06:44:56 GMT http://en.wikipedia.org/wiki/DLL_hell In computing, DLL hell is the colourful phrase for dynamic-link library problems coined by Rick Anderson in his January 2000 paper, The End of DLL Hell. Although the term DLL Hell had been used internally for some time within Microsoft, this was the first public article to do so. DLL Hell encompasses the difficulties of managing dynamic-link libraries (DLLs) in Microsoft Windows operating systems. Computing > Software narky Wed, 31 May 2006 09:18:32 GMT http://en.wikipedia.org/wiki/Donnie_darko Donnie Darko is a 2001 cult film, the first by writer and director Richard Kelly. Set in 1988, the movie is a psychological science fiction film about a boy named Donnie Darko who, after narrowly escaping death, has visions of an eerie, bipedal, giant rabbit named Frank who predicts when the world will end. It stars Jake Gyllenhaal as Donnie, Jena Malone, Mary McDonnell, Drew Barrymore, Patrick Swayze, Noah Wyle and Maggie Gyllenhaal. Media > Movies and TV shows narky Thu, 01 Jun 2006 09:49:03 GMT http://en.wikipedia.org/wiki/Fixed_point_property In mathematics, a topological space X has the fixed point property if all continuous mappings from X to X have a fixed point. Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups narky Tue, 01 May 2007 02:50:22 GMT http://en.wikipedia.org/wiki/Fixed-point_theorem In mathematics, a fixed-point theorem is a result saying that a function F will have at least one fixed point (a point x for which F(x) = x), under some conditions on F that can be stated in general terms. Results of this kind are amongst the most generally useful in mathematics. The Banach fixed point theorem gives a general criterion guaranteeing that, if it is satisfied, the procedure of iterating a function yields a fixed point. By contrast, the Brouwer fixed point theorem is a non-constructive result: it says that any continuous function from the closed unit ball in n-dimensional Euclidean space to itself must have a fixed point, but it doesn't describe how to find the fixed point (See also Sperner's lemma). Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups narky Tue, 01 May 2007 02:51:32 GMT http://en.wikipedia.org/wiki/Matt_Groening Matthew Abram Groening (born February 15, 1954 in Portland, Oregon) is an American cartoonist and the creator of the American animated television series The Simpsons [1] and Futurama. Media > Movies and TV shows narky Tue, 30 May 2006 09:50:42 GMT