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—And He Built A Crooked House
'—And He Built a Crooked House—' is a science fiction short story by American writer Robert A. Heinlein, first published in ''Astounding Science Fiction'' in February 1941. It was reprinted in the anthology '' Fantasia Mathematica'' (Clifton Fadiman, ed.) in 1958, and in the Heinlein collections '' The Unpleasant Profession of Jonathan Hoag'' in 1959 and ''The Best of Robert Heinlein'' in 1973. The story is about a mathematically inclined architect named Quintus Teal who has what he thinks is a brilliant idea to save on real estate costs by building a house shaped like the unfolded net of a tesseract. The title is paraphrased from the nursery rhyme " There Was a Crooked Man". Plot summary Quintus Teal, a "Graduate Architect" in the Los Angeles area, wants architects to be inspired by topology and the Picard–Vessiot theory. During a conversation with friend Homer Bailey he shows models made of toothpicks and clay, representing projections of a four-dimensional tesseract, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WikiProject Novels
A WikiProject, or Wikiproject, is an affinity group for contributors with shared goals within the Wikimedia movement. WikiProjects are prevalent within the largest wiki, Wikipedia, and exist to varying degrees within Wikimedia project, sibling projects such as Wiktionary, Wikiquote, Wikidata, and Wikisource. They also exist in different languages, and translation of articles is a form of their collaboration. During the COVID-19 pandemic, CBS News noted the role of Wikipedia's WikiProject Medicine in maintaining the accuracy of articles related to the disease. Another WikiProject that has drawn attention is WikiProject Women Scientists, which was profiled by ''Smithsonian Magazine, Smithsonian'' for its efforts to improve coverage of women scientists which the profile noted had "helped increase the number of female scientists on Wikipedia from around 1,600 to over 5,000". On Wikipedia Some Wikipedia WikiProjects are substantial enough to engage in cooperative activities with outsi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Picard–Vessiot Theory
In differential algebra, Picard–Vessiot theory is the study of the differential field extension generated by the solutions of a linear differential equation, using the differential Galois group of the field extension. A major goal is to describe when the differential equation can be solved by quadratures in terms of properties of the differential Galois group. The theory was initiated by Émile Picard and Ernest Vessiot from about 1883 to 1904. and give detailed accounts of Picard–Vessiot theory. History The history of Picard–Vessiot theory is discussed by . Picard–Vessiot theory was developed by Picard between 1883 and 1898 and by Vessiot from 1892 to 1904 (summarized in and ). The main result of their theory says very roughly that a linear differential equation can be solved by quadratures if and only if its differential Galois group is connected and solvable. Unfortunately it is hard to tell exactly what they proved as the concept of being "solvable by quadratur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Short Stories By Robert A
Short may refer to: Places * Short (crater), a lunar impact crater on the near side of the Moon * Short, Mississippi, an unincorporated community * Short, Oklahoma, a census-designated place People * Short (surname) * List of people known as the Short Companies * Short Brothers, a British aerospace company * Short Brothers of Sunderland, a former English shipbuilder Computing and technology * Short circuit, an accidental connection between two nodes of an electrical circuit * Short integer, a computer datatype Other uses * Short film, a cinema format, also called a short * Short (finance), stock-trading position * Short (cricket), fielding positions closer to the batsman * SHORT syndrome, a medical condition in which affected individuals have multiple birth defects * Short vowel, a vowel sound of short perceived duration * Holly Short, a fictional character in the ''Artemis Fowl'' series See also * Short time, a situation in which a civilian employee works reduced hours, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Four-dimensional Geometry
Four-dimensional space (4D) is the mathematical extension of the concept of three-dimensional space (3D). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called ''dimensions'', to describe the sizes or locations of objects in the everyday world. This concept of ordinary space is called Euclidean space because it corresponds to Euclid 's geometry, which was originally abstracted from the spatial experiences of everyday life. Single locations in Euclidean 4D space can be given as vectors or '' 4-tuples'', i.e., as ordered lists of numbers such as . For example, the volume of a rectangular box is found by measuring and multiplying its length, width, and height (often labeled , , and ). It is only when such locations are linked together into more complicated shapes that the full richness and geometric complexity of 4D spaces emerge. A hint of that complexity can be seen in the accompanying 2D animation of one of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1941 Short Stories
The Correlates of War project estimates this to be the deadliest year in human history in terms of conflict deaths, placing the death toll at 3.49 million. However, the Uppsala Conflict Data Program estimates that the subsequent year, 1942, was the deadliest such year. Death toll estimates for both 1941 and 1942 range from 2.28 to 7.71 million each. Events Below, the events of World War II have the "WWII" prefix. January * January– August – 10,072 men, women and children with mental and physical disabilities are asphyxiated with carbon monoxide in a gas chamber, at Hadamar Euthanasia Centre in Germany, in the first phase of mass killings under the Aktion T4 program here. * January 1 – Thailand's Prime Minister Plaek Phibunsongkhram decrees January 1 as the official start of the Thai solar calendar new year (thus the previous year that began April 1 had only 9 months). * January 3 – A decree (''Normalschrifterlass'') promulgated in Germany by Martin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Archive
The Internet Archive is an American 501(c)(3) organization, non-profit organization founded in 1996 by Brewster Kahle that runs a digital library website, archive.org. It provides free access to collections of digitized media including websites, Application software, software applications, music, audiovisual, and print materials. The Archive also advocates a Information wants to be free, free and open Internet. Its mission is committing to provide "universal access to all knowledge". The Internet Archive allows the public to upload and download digital material to its data cluster, but the bulk of its data is collected automatically by its web crawlers, which work to preserve as much of the public web as possible. Its web archiving, web archive, the Wayback Machine, contains hundreds of billions of web captures. The Archive also oversees numerous Internet Archive#Book collections, book digitization projects, collectively one of the world's largest book digitization efforts. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Subway Named Mobius
"A Subway Named Mobius" is a 1950 science fiction short story by American astronomer Armin Joseph Deutsch. Originally published in ''Astounding Science Fiction'', it imagines the results of increasing the complexity of the Boston MTA system (now the MBTA) with a new interconnection. It has been collected in anthologies since its original publication, and was nominated for a Retro Hugo Award in 2001, placing fourth in the final vote. Plot Shortly after the opening of a new track known as the Boylston Shuttle, Boston MTA train No. 86 goes missing. Whyte, the manager of the system, cannot explain its disappearance nor account for the fact that the system acts as though it was still there, drawing power and causing signals to operate automatically, sometimes miles apart. It falls to mathematician Professor Roger Tupelo of Harvard to attempt an explanation. Though not a topologist himself, he believes that the new shuttle connection caused the topological complexity of the system ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voyager
Voyager may refer to: Computing and communications * LG Voyager, a mobile phone model manufactured by LG Electronics * NCR Voyager, a computer platform produced by NCR Corporation * Voyager (computer worm), a computer worm affecting Oracle databases * Voyager (library program), the integrated library system from Ex Libris Group * Voyager (web browser), a web browser for Amiga computers * Voyager Digital, a defunct cryptocurrency brokerage company * HP Voyager series, code name for a Hewlett-Packard series of handheld programmable calculators Transport Air * Airbus Voyager, Royal Air Force version of the Airbus A330 MRTT * Frequent flyer program of South African Airways * Egvoyager Voyager 203, an Italian ultralight aircraft * Raj Hamsa Voyager, an Indian ultralight trike design * Rutan Voyager, the first airplane to fly around the world nonstop without refuelling Land * Bombardier Voyager, a high-speed train operated in the United Kingdom ** Bombardier ''Voyager'' (Britis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flatland
''Flatland: A Romance of Many Dimensions'' is a satirical novella by the English schoolmaster Edwin Abbott Abbott, first published in 1884 by Seeley & Co. of London. Written pseudonymously by "A Square", the book used the fictional two-dimensional world of Flatland to comment on the hierarchy of Victorian culture, but the novella's more enduring contribution is its examination of dimensions. A sequel, '' Sphereland'', was written by Dionys Burger in 1957. Several films have been based on ''Flatland'', including the feature film '' Flatland'' (2007). Other efforts have been short or experimental films, including one narrated by Dudley Moore and the short films '' Flatland: The Movie'' (2007) and '' Flatland 2: Sphereland'' (2012). Plot The story describes a two-dimensional world inhabited by geometric figures (flatlanders); women are line segments, while men are polygons with various numbers of sides. The narrator is a square, a member of the caste of gentlemen and p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Sagan
Carl Edward Sagan (; ; November 9, 1934December 20, 1996) was an American astronomer, planetary scientist and science communicator. His best known scientific contribution is his research on the possibility of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by exposure to light. He assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, which were universal messages that could potentially be understood by any Extraterrestrial life, extraterrestrial intelligence that might find them. He argued in favor of the hypothesis, which has since been accepted, that the high surface temperatures of Venus are the result of the greenhouse effect.Extract of page 14 Initially an assistant professor at Harvard Universi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joshua Tree National Park
Joshua Tree National Park is a List of national parks of the United States, US National Park located in southeastern California, straddling north-central Riverside County, California, Riverside County and part of southern San Bernardino County, California, San Bernardino County. Named after the Endemism, endemic Joshua tree (''Yucca brevifolia''), found in the park and surrounding areas, Joshua Tree is situated some 130 miles (211 km) east of the city of Los Angeles and roughly 78 mi (125 km) east of the city of San Bernardino, California, San Bernardino. Among some of the closest cities to the park are Indio, California, Indio, Palm Desert, California, Palm Desert, and Palm Springs, California, Palm Springs. Originally declared a National monument (United States), national monument in 1936, Joshua Tree was redesignated as a national park in 1994 when the United States Congress, U.S. Congress passed the California Desert Protection Act of 1994, California Desert Pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
