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51 (number)
51 (fifty-one) is the natural number following 50 and preceding 52. In mathematics Fifty-one is * a pentagonal number as well as a centered pentagonal number and an 18-gonal number *the 6th Motzkin number, telling the number of ways to draw non-intersecting chords between any six points on a circle's boundary, no matter where the points may be located on the boundary. *a Perrin number., coming after 22, 29, 39 in the sequence (and the sum of the first two) * a Størmer number, since the greatest prime factor of 512 + 1 = 2602 is 1301, which is substantially more than 51 twice. *There are 51 different cyclic Gilbreath permutations on 10 elements, and therefore there are 51 different real periodic points of order 10 on the Mandelbrot set.. *Since 51 is the product of the distinct Fermat primes 3 and 17, a regular polygon with 51 sides is constructible with compass and straightedge, the angle is constructible, and the number cos is expressible in terms of square roots. In ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal number, cardinal numbers'', and numbers used for ordering are called ''Ordinal number, ordinal numbers''. Natural numbers are sometimes used as labels, known as ''nominal numbers'', having none of the properties of numbers in a mathematical sense (e.g. sports Number (sports), jersey numbers). Some definitions, including the standard ISO/IEC 80000, ISO 80000-2, begin the natural numbers with , corresponding to the non-negative integers , whereas others start with , corresponding to the positive integers Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). The natural ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Constructible Number
In geometry and algebra, a real number r is constructible if and only if, given a line segment of unit length, a line segment of length , r, can be constructed with compass and straightedge in a finite number of steps. Equivalently, r is constructible if and only if there is a closed-form expression for r using only integers and the operations for addition, subtraction, multiplication, division, and square roots. The geometric definition of constructible numbers motivates a corresponding definition of constructible points, which can again be described either geometrically or algebraically. A point is constructible if it can be produced as one of the points of a compass and straight edge construction (an endpoint of a line segment or crossing point of two lines or circles), starting from a given unit length segment. Alternatively and equivalently, taking the two endpoints of the given segment to be the points (0, 0) and (1, 0) of a Cartesian coordinate system, a point is const ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AD 51
AD 51 ( LI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Scipio (or, less frequently, year 804 ''Ab urbe condita''). The denomination AD 51 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Emperor Claudius and future emperor Titus Flavius Vespasianus are Roman Consuls. * Burrus, praetorian prefect (51–62 AD), is charged by Seneca with the education of Nero. * In Britain, governor Publius Ostorius Scapula defeats Caratacus and the Silures in the territory of the Ordovices in central Wales. Caratacus seeks sanctuary with Cartimandua, queen of the Brigantes in northern England, but she is a Roman ally and hands him over to Ostorius. Despite the defeat, the Silures continue to fight. * The captured Caratacus is exhibi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Hamilton
Alexander Hamilton (January 11, 1755 or 1757July 12, 1804) was an American military officer, statesman, and Founding Father who served as the first United States secretary of the treasury from 1789 to 1795. Born out of wedlock in Charlestown, Nevis, Hamilton was orphaned as a child and taken in by a prosperous merchant. He pursued his education in New York before serving as an artillery officer in the American Revolutionary War. Hamilton saw action in the New York and New Jersey campaign, served for years as an aide to General George Washington, and helped secure American victory at the Siege of Yorktown. After the war, Hamilton served as a delegate from New York to the Congress of the Confederation. He resigned to practice law and founded the Bank of New York. In 1786, Hamilton led the Annapolis Convention to replace the Articles of Confederation with the Constitution of the United States, which he helped ratify by writing 51 of the 85 installments of ''The Federalist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emergency!
''Emergency!'' is an American action-adventure medical drama television series jointly produced by Mark VII Limited and Universal Television. Debuting on NBC as a midseason replacement on January 15, 1972, replacing the two short-lived situation comedy series ''The Partners'' and '' The Good Life'', it ran for a total of 122 episodes until May 28, 1977, with six additional two-hour television films during the next two years, 1978 and 1979. The series stars Randolph Mantooth and Kevin Tighe as two rescuers, who work as paramedics and firefighters in the Los Angeles metropolitan area. The duo formed Squad 51, a medical and rescue unit of the Los Angeles County Fire Department, working together with the fictional Rampart General Hospital medical staff (portrayed by Robert Fuller, Julie London and Bobby Troup), and with the firefighter engine company at Station 51. ''Emergency!'' was created and produced by Jack Webb and Robert A. Cinader, who had also created the police dramas ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Area 51
Area 51 is the common name of a highly classified United States Air Force (USAF) facility within the Nevada Test and Training Range. A remote detachment administered by Edwards Air Force Base, the facility is officially called Homey Airport or Groom Lake (after the salt flat next to its airfield). Details of its operations are not made public, but the USAF says that it is an open training range, and it is commonly thought to support the development and testing of experimental aircraft and weapons systems. The USAF and CIA acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft. The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component of unidentified flying object (UFO) folklore. It has never been declared a secret base, but all research and occurrences in Area 51 are Top Secret/Sensitive Compartmented Information (TS/SCI). The CIA publicly acknowledged the base's existence on June 25, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doc Hudson
Doctor Hudson Hornet, MD (also known as The Fabulous Hudson Hornet, Hud, Doc Hudson, or simply, Doc) is an animated, anthropomorphic retired race car which appears in the 2006 Pixar film ''Cars'' as a medical doctor and a local judge. He is voiced by actor Paul Newman in the first and third films and the video game, and Corey Burton in all other media. Six-time Turismo Carretera champion Juan María Traverso voiced the character in the Rioplatense Spanish version of the first film. He is modeled after a 1951 Hudson Hornet. Character Doc Hudson (voiced by Paul Newman in his last non-documentary film role and in his only animated film role) was Radiator Springs' local physician. His license plate read 51HHMD which was a reference to his year and track number (51), model (Hudson Hornet) and profession (medical doctor). A racer-turned-mechanic, the character had Newman's blue eyes. Hudson's stickers said "twin H power" which was an optional dealer-installed dual carburetor intake ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cars (film)
''Cars'' is a 2006 American computer-animated Sports comedy, sports comedy film produced by Pixar Animation Studios and released by Walt Disney Pictures. The film was directed by John Lasseter from a screenplay by Dan Fogelman, Lasseter, Joe Ranft, Kiel Murray, Phil Lorin, and Jorgen Klubien and a story by Lasseter, Ranft, and Klubien, and was the final film independently produced by Pixar after its purchase by Disney in January 2006. The film features an ensemble voice cast of Owen Wilson, Paul Newman (in his final voice acting theatrical film role), Bonnie Hunt, Larry the Cable Guy, Tony Shalhoub, Cheech Marin, Michael Wallis, George Carlin, Paul Dooley, Jenifer Lewis, Guido Quaroni, Michael Keaton, Katherine Helmond, John Ratzenberger and Richard Petty, while race car drivers Dale Earnhardt Jr. (as "Junior"), Mario Andretti, Michael Schumacher and car enthusiast Jay Leno (as "Jay Limo") voice themselves. Set in a world populated entirely by Anthropomorphism, anthropomorphic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azerbaijan Grand Prix
The Azerbaijan Grand Prix ( az, Azərbaycan Qran Prisi) is a Formula One motor racing event that was held for the first time in . It is held on the Baku City Circuit, a street circuit in Baku, the capital of Azerbaijan. The event is due to take place at the Baku City Circuit until at least 2024. History The first Formula One Grand Prix to be held in Azerbaijan was the 2016 European Grand Prix, which took place at the Baku City Circuit. A year later, in 2017, the same venue hosted the first Azerbaijan Grand Prix. The race was held on 25 June and was one of five races to be held on a street circuit during the 2017 Formula One season, along with the Singapore, Monaco, Australian and Canadian Grands Prix. The first Azerbaijan Grand Prix winner was Daniel Ricciardo of Red Bull. The 2018 Azerbaijan Grand Prix took place on 29 April as the 4th round of the season and was won by Lewis Hamilton. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2016 United States Wireless Spectrum Auction
The 2016 United States wireless spectrum auction, officially known as Auction 1001, allocated approximately 100 MHz of the United States Ultra High Frequency (UHF) spectrum formerly allocated to UHF television in the 600 MHz band. The spectrum auction and subsequent reallocations were authorized by Title VI (The Spectrum Act) of the payroll tax cut extension passed by the United States Congress on February 17, 2012. Background The 2008 United States wireless spectrum auction, dealing with allocations for UHF television in the 700 MHz band, generated $19.6 billion from companies such as AT&T and Verizon Communications. This auction re-allocated the UHF space formerly occupied by channels 52–69, after the completion of the primary digital television transition in the United States from NTSC to ATSC in 2009. In effect, the digital transition had eliminated 25% of the space allocated for UHF television in the United States. Wireless broadband internet access interest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultra High Frequency
Ultra high frequency (UHF) is the ITU designation for radio frequency, radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter). Radio waves with frequencies above the UHF band fall into the super-high frequency (SHF) or microwave frequency range. Lower frequency signals fall into the VHF (very high frequency) or lower bands. UHF radio waves propagate mainly by Line-of-sight propagation, line of sight; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception. They are used for UHF television broadcasting, television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, satellite phones, and numerous other applications. The Institute of Electrical and Electronics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Television Channel
A television channel is a terrestrial frequency or virtual number over which a television station or television network is distributed. For example, in North America, "channel 2" refers to the terrestrial or cable band of 54 to 60 MHz, with carrier frequencies of 55.25 MHz for NTSC analog video (VSB) and 59.75 MHz for analog audio ( FM), or 55.31 MHz for digital ATSC (8VSB). Channels may be shared by many different television stations or cable-distributed channels depending on the location and service provider Depending on the multinational bandplan for a given regional n, analog television channels are typically 6, 7, or 8 MHz in bandwidth, and therefore television channel frequencies vary as well. Channel numbering is also different. Digital terrestrial television channels are the same as their analog predecessors for legacy reasons, however through multiplexing, each physical radio frequency (RF) channel can carry several digital subchannels. On sat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
