|
F4 Tornadoes By Date
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 Art ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flanders F
Flanders ( or ; ) is the Dutch language, Dutch-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 Flemings, Fleming, while the corresponding adjective is Flemish people, Flemish, which can also refer to the collective of Dutch dialects spoken in that area, or more generally the Belgian variant of Standard Dutch. Most Flemings live within the Flemish Region, which is a federal state within Belgium with its own elected government. However, like Belgium itself, the official capital of Flanders is the City of Brussels, which lies within the Brussels, Brussels-Capital Region, not the Flemish Region, and the majority of residents there are French speaking. The powers of the Flemish Government in Brussels are limited mainly ... [...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 ... [...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 () 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 The Bosporus or Bosphorus Strait ( ; , colloquially ) is a natural strait and an internationally significant waterway located in Istanbul, Turkey. The Bosporus connects the Black Sea to the Sea of Marmara and forms one of the continental bo .... It is connected to the M6 line at Boğaziçi Üniversitesi. The entrance to Boğaziçi Üniversitesi station is constructed next to the main entrance to Boğaziçi University. Line References Istanbul Metro Standard-gauge ... [...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 Named after 19th century English player Henry Bird, Bird's opening 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 continu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algebraic Notation (chess)
Algebraic notation is the standard method of chess notation, used for recording and describing moves. It is based on a system of coordinates to identify each square on the board uniquely. It is now almost universally used by books, magazines, newspapers and software, and is the only form of notation recognized by FIDE, the international chess governing body. An early form of algebraic notation was invented by the Syrian player Philip Stamma in the 18th century. In the 19th century, it came into general use in German chess literature and was subsequently adopted in Russian chess literature. Descriptive notation, based on abbreviated natural language, was generally used in English language chess publications until the 1980s. Similar descriptive systems were in use in Spain and France. A few players still use descriptive notation, but it is no longer recognized by FIDE, and may not be used as evidence in the event of a dispute. The term "algebraic notation" may be considered a misn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formula 4
FIA Formula 4 (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 in March 2013 by the Fédération Internationale de l'Automobile (FIA)—the International sanctioning and administrative body for motorsport—after approval by the World Motor Sport Council as an entry-level category for young drivers, bridging the gap between Kart racing, 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 Series, GP2 and GP3 Series, which had seen several nat ... [...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. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fermat Number
In mathematics, a Fermat number, named after Pierre de Fermat (1601–1665), the first known to have studied them, is a natural number, positive integer of the form:F_ = 2^ + 1, where ''n'' is a non-negative integer. The first few Fermat numbers are: 3 (number), 3, 5 (number), 5, 17 (number), 17, 257 (number), 257, 65537 (number), 65537, 4294967297, 18446744073709551617, 340282366920938463463374607431768211457, ... . If 2''k'' + 1 is Prime number, prime and , then ''k'' itself must be a power of 2, so is a Fermat number; such primes are called Fermat primes. , the only known Fermat primes are , , , , and . 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 . 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 numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F4 (mathematics)
In mathematics, F4 is a Lie group and also its Lie algebra f4. It is one of the five exceptional simple Lie groups. F4 has rank 4 and dimension 52. The compact form is simply connected and its outer automorphism group is the trivial group. Its fundamental representation is 26-dimensional. The compact real form of F4 is the isometry group of a 16-dimensional Riemannian manifold known as the octonionic projective plane OP2. This can be seen systematically using a construction known as the Freudenthal magic square, ''magic square'', due to Hans Freudenthal and Jacques Tits. There are list of simple Lie groups, 3 real forms: a compact one, a split one, and a third one. They are the isometry groups of the three real Albert algebras. The F4 Lie algebra may be constructed by adding 16 generators transforming as a spinor to the 36-dimensional Lie algebra so(9), in analogy with the construction of E8 (mathematics), E8. In older books and papers, F4 is sometimes denoted by E4. Alg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samsung Electronics
Samsung Electronics Co., Ltd. (SEC; stylized as SΛMSUNG; ) is a South Korean multinational major appliance and consumer electronics corporation founded on 13 January 1969 and headquartered in Yeongtong District, Suwon, South Korea. It is currently the pinnacle of the Samsung ''chaebol'', accounting for 70% of the group's revenue in 2012, and has played a key role in the group's corporate governance due to cross ownership. It is majority-owned by foreign investors. Samsung Electronics is the world's List of largest technology companies by revenue, second-largest technology company by revenue, and its market capitalization stood at US$520.65 billion, the 12th largest in the world. It became the world's largest manufacturer of smartphones in 2024. Samsung is known most notably for its Samsung Galaxy brand consisting of phones such as its flagship Samsung Galaxy S series, Galaxy S series, popular midrange Samsung Galaxy A series, Galaxy A series as well as the premium Samsu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smartphone
A smartphone is a mobile phone with advanced computing capabilities. It typically has a touchscreen interface, allowing users to access a wide range of applications and services, such as web browsing, email, and social media, as well as multimedia playback and Streaming media, streaming. Smartphones have built-in cameras, GPS navigation, and support for various communication methods, including voice calls, text messaging, and internet-based messaging apps. Smartphones are distinguished from older-design feature phones by their more advanced hardware capabilities and extensive mobile operating systems, access to the internet, business applications, Mobile payment, mobile payments, and multimedia functionality, including music, video, mobile gaming, gaming, Internet radio, radio, and Mobile television, television. Smartphones typically feature MOSFET, metal–oxide–semiconductor (MOS) integrated circuit (IC) chips, various sensors, and support for multiple wireless communicati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Android (operating System)
Android is an operating system based on a modified version of the Linux kernel and other open-source software, open-source software, designed primarily for touchscreen-based mobile devices such as smartphones and tablet computer, tablets. Android has historically been developed by a consortium of developers known as the Open Handset Alliance, but its most widely used version is primarily developed by Google. First released in 2008, Android is the world's Usage share of operating systems, most widely used operating system; the latest version, released on June 10, 2025, is Android 16. At its core, the operating system is known as the Android Open Source Project (AOSP) and is free and open-source software (FOSS) primarily licensed under the Apache License. However, most devices run the proprietary software, proprietary Android version developed by Google, which ships with additional proprietary closed-source software pre-installed, most notably Google Mobile Services (GMS), which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
