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F4 (band) Members
F4, F.IV, F04, F 4, F.4 or F-4 may refer to: Aircraft * Flanders F.4, a 1910s British experimental military two-seat monoplane aircraft * Martinsyde F.4 Buzzard, a British World War I fighter version of the Martinsyde Buzzard biplane * Fokker F.IV, a 1921 Dutch airliner * Caproni Vizzola F.4, an Italian prototype fighter of 1939 * Lockheed F-4 Lightning, a reconnaissance variant of the Lockheed P-38 Lightning World War 2 fighter * Fleetwings Sea Bird, a variant of which was the F-4 * A number of aircraft that first entered service with the U.S. Navy: ** Curtiss F4C, a 1920s version of the Naval Aircraft Factory TS biplane fighter ** Boeing F4B, a 1930s version of the Boeing P-12 biplane fighter ** Grumman F4F Wildcat, a carrier-based fighter aircraft in World War 2 ** Vought F4U Corsair, a World War 2 fighter ** Douglas F4D Skyray, a carrier-based fighter/interceptor, first flight 1951 ** McDonnell Douglas F-4 Phantom II, a supersonic fighter-bomber, first flight 1958 Ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flanders F
Flanders (, ; Dutch: ''Vlaanderen'' ) is the Flemish-speaking northern portion of Belgium and one of the communities, regions and language areas of Belgium. However, there are several overlapping definitions, including ones related to culture, language, politics, and history, and sometimes involving neighbouring countries. The demonym associated with Flanders is Fleming, while the corresponding adjective is Flemish. The official capital of Flanders is the City of Brussels, although the Brussels-Capital Region that includes it has an independent regional government. The powers of the government of Flanders consist, among others, of economic affairs in the Flemish Region and the community aspects of Flanders life in Brussels, such as Flemish culture and education. Geographically, Flanders is mainly flat, and has a small section of coast on the North Sea. It borders the French department of Nord to the south-west near the coast, the Dutch provinces of Zeeland, North Brabant and L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Faugère's F4 And F5 Algorithms
In computer algebra, the Faugère F4 algorithm, by Jean-Charles Faugère, computes the Gröbner basis of an ideal of a multivariate polynomial ring. The algorithm uses the same mathematical principles as the Buchberger algorithm, but computes many normal forms in one go by forming a generally sparse matrix and using fast linear algebra to do the reductions in parallel. The Faugère F5 algorithm first calculates the Gröbner basis of a pair of generator polynomials of the ideal. Then it uses this basis to reduce the size of the initial matrices of generators for the next larger basis: If ''G''prev is an already computed Gröbner basis (''f''2, …, ''f''''m'') and we want to compute a Gröbner basis of (''f''1) + ''G''prev then we will construct matrices whose rows are ''m'' ''f''1 such that ''m'' is a monomial not divisible by the leading term of an element of ''G''prev. This strategy allows the algorithm to apply two new criteria based on what Faugère calls ''s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MV Agusta F4 Series
The MV Agusta F4 is an inline four-cylinder sport bike made by MV Agusta from 1999 until 2018. It was the motorcycle that launched the resurrection of the brand in 1998. The F4 was created by motorcycle designer Massimo Tamburini at CRC (Cagiva Research Center), following his work on the Ducati 916. The F4 has a single-sided swingarm, large diameter () front forks and traditional MV Agusta red and silver livery. The F4 engine is also one of the few production superbikes to have a hemi-spherical cylinder head chamber design with 4 valves per cylinder. Engine The F4 engine is a liquid cooled inline four cylinder four-stroke set across the frame with two overhead camshafts (DOHC), 16 'radial' valves, electronic multipoint fuel injection, and induction discharge electronic ignition having engine displacements of , , and . The engine was derived from the 1990–1992 Ferrari Formula One engine. Early in the design process Ferrari engineers assisted in the development of the engine. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Front-engine, Four-wheel-drive Layout
In automotive design, an F4, or front-engine, four-wheel drive (4WD) layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This layout is typically chosen for better control on many surfaces, and is an important part of rally racing, as well as off-road driving. In terms of racing purposes, whether it be on-road or off-road, can be described as follows, A team that pursues the Weak LS4WD architecture will minimize the development cost of the front-wheel drive system at the expense of having a larger rear powertrain. The Weak architecture produces a vehicle with a large powersplit between the front and rear powertrains, while the Strong architecture recommends a vehicle with more similar power and torque requirements for the front and rear. Most four-wheel-drive layouts are front-engined and are derivatives of earlier front-engine, rear-wheel drive, or front-engine, front-wheel drive designs. The first origins of it were in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albarka Air
Albarka Air was an airline based in Abuja, Nigeria. It operated scheduled and charter services within Nigeria and charters to other countries in central and west Africa. Its main base was Nnamdi Azikiwe International Airport, Abuja.Flight International 27 March 2007 Code data * IATA Code: F4 * ICAO Code: NBK * Callsign: AL-AIR Destinations Albarka Air operated services to the following domestic scheduled destinations (at January 2005): Abuja, Lagos, Maiduguri Maiduguri is the capital and the largest city of Borno State in north-eastern Nigeria. The city sits along the seasonal Ngadda River which disappears into the ''Firki'' swamps in the areas around Lake Chad. Maiduguri was founded in 1907 as a mil ... and Yola. References Defunct airlines of Nigeria Airlines established in 1999 Airlines disestablished in 2007 1999 establishments in Nigeria 2007 disestablishments in Nigeria Economy of Abuja {{Nigeria-airline-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F4 Cross Harbour
The Cross Harbour ferry service, officially known as F4 Cross Harbour, was a commuter ferry service in Sydney, New South Wales. Part of the Sydney Ferries network, it was operated by Transdev Sydney Ferries and serviced the Darling Harbour, Lavender Bay, Rose Bay, and Watsons Bay areas. Introduced on 26 November 2017, the service replaced the entirety of the predecessor F4 Darling Harbour service and the Watsons Bay stopping pattern of the F7 Eastern Suburbs service. Emerald-class ferries and SuperCat ferries operated the service. On 25 October 2020, the service ceased operations and was split up into F4 Pyrmont Bay and F9 Watsons Bay services. History Prior to the introduction of the Cross Harbour route, service patterns on the Sydney Ferries network were often divided between wharves located west of Circular Quay, and wharves located east, with the exception of a short-lived service in the mid-1990s that linked McMahons Point and Rose Bay. The Cross Harbour service ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F4 (Istanbul Metro)
The F4, officially referred to as the F4 Boğaziçi Üni./Hisarüstü–Aşiyan funicular line ( tr, F4 Boğaziçi Üni./Hisarüstü–Aşiyan füniküler hattı) is a long funicular railway in Beşiktaş, Istanbul. When opened on 28 October 2022, it became the fourth funicular line in Istanbul as well as the longest, surpassing the F3 line by . The F4 line will traverse a height difference of about and total travel time is estimated at 2 minutes and 30 seconds. The line begins at Boğaziçi Üniversitesi station and heads east to Aşiyan along the Bosporus. Connection to the M6 line at Boğaziçi Üniversitesi will be available. The entrance to Boğaziçi Üniversitesi station will be constructed next to the main entrance to Boğaziçi University Boğaziçi University ( tr, Boğaziçi Üniversitesi), also known as Bosphorus University, is a major research university in Istanbul, Turkey. Its main campus is located on the European side of the Bosphorus strait. It has six ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bird's Opening
Bird's Opening (or the Dutch Attack) is a chess opening characterised by the move: :1. f4 Bird's is a standard flank opening. White's strategic ideas involve control of the e5-square, offering good attacking chances at the expense of slightly weakening their own . Black may challenge White's plan to control e5 immediately by playing From's Gambit (1...e5); however, the From Gambit is notoriously double-edged and should only be played after significant study. The ''Encyclopaedia of Chess Openings'' assigns two codes for Bird's Opening: A02 (1.f4) and A03 (1.f4 d5). History The opening was mentioned by Luis Ramírez de Lucena in his book ''Repetición de Amores y Arte de Ajedrez con Cien Juegos de Partido'', published c. 1497. In the mid-nineteenth century the opening was sometimes played by La Bourdonnais and Elijah Williams, among others. The British master Henry Edward Bird first played it in 1855 and continued to do so for the next 40 years. In 1885, the '' Hereford Tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algebraic Notation (chess)
Algebraic notation (or AN) is the standard method for recording and describing the moves in a game of chess. It is based on a system of coordinates to uniquely identify each square on the chessboard. It is used by most books, magazines, and newspapers. In English-speaking countries, the parallel method of descriptive notation was generally used in chess publications until about 1980. A few players still use descriptive notation, but it is no longer recognized by FIDE, the international chess governing body. Algebraic notation exists in various forms and languages and is based on a system developed by Philipp Stamma. Stamma used the modern names of the squares, but he used p for pawn moves and the original of a piece (a through h) instead of the initial letter of the piece name. The term "algebraic notation" may be considered a misnomer, as the system is unrelated to algebra. Other terms such as "standard notation" and "coordinate notation" have been proposed, but the tradit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formula 4
FIA Formula 4, also called FIA F4, is an open-wheel racing car category intended for junior drivers. There is no global championship, but rather individual nations or regions can host their own championships in compliance with a universal set of rules and specifications. The category was created by the Fédération Internationale de l'Automobile (FIA)—the International sanctioning and administrative body for motorsport—as an entry-level category for young drivers, bridging the gap between karting and Formula 3. The series is a part of the FIA Global Pathway. Former Formula One driver Gerhard Berger was appointed as the FIA Single-Seater Commission president to oversee the creation of the category as a response to declining interest in national Formula 3 championships due to rising costs and alternate pathways to Formula One such as the then Formula Renault and GP2 and GP3 Series, which had seen several national Formula 3 championships discontinued. In the place of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F4 (classification)
F4, also T4 and SP4, is a wheelchair sport classification that corresponds to the neurological level T1- T7. Historically, it was known as 1C Incomplete, 2 Complete, or Upper 3 Complete. People in this class have normal upper limb function, and functional issues with muscles below the nipple line. There are comparable F4 classes in a number of sports. For athletics, these are T54 and F54. In cycling, these are H4 or H5. Swimming classes include S3, SB3, S4 and S5. The process for classification into this class has a medical and functional classification process. This process is often sport specific. Definition This is wheelchair sport classification that corresponds to the neurological level T1- T7. In the past, this class was known as 1C Incomplete, 2 Complete, or Upper 3 Complete. In 2002, USA Track & Field defined this class as, "These athletes have normal upper limb function as well as backward movement of the trunk, often with rotation movements of the trunk. They ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fermat Number
In mathematics, a Fermat number, named after Pierre de Fermat, who first studied them, is a positive integer of the form :F_ = 2^ + 1, where ''n'' is a non-negative integer. The first few Fermat numbers are: : 3, 5, 17, 257, 65537, 4294967297, 18446744073709551617, ... . If 2''k'' + 1 is prime and ''k'' > 0, then ''k'' must be a power of 2, so 2''k'' + 1 is a Fermat number; such primes are called Fermat primes. , the only known Fermat primes are ''F''0 = 3, ''F''1 = 5, ''F''2 = 17, ''F''3 = 257, and ''F''4 = 65537 ; heuristics suggest that there are no more. Basic properties The Fermat numbers satisfy the following recurrence relations: : F_ = (F_-1)^+1 : F_ = F_ \cdots F_ + 2 for ''n'' ≥ 1, : F_ = F_ + 2^F_ \cdots F_ : F_ = F_^2 - 2(F_-1)^2 for ''n'' ≥ 2. Each of these relations can be proved by mathematical induction. From the second equation, we can deduce Goldbach's theorem (named after Christian Goldbach): no two Fermat numbers share a common integer factor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
