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→ (other)
→ or -> may refer to: * one of the arrow symbols, characters of Unicode * one of the arrow keys, on a keyboard * →, >, representing the assignment operator in various programming languages * ->, a Pointer operator in C and C++ where a->b is synonymous with (*a).b (except when either -> or * has been overridden in C++). * →, goto in the APL programming language * →, representing the direction of a chemical reaction in a chemical equation * →, representing the set of all mathematical functions that map from one set to another in set theory * →, representing a material implication in logic * →, representing morphism in category theory * →, representing a vector in physics and mathematics * the relative direction of right or forward * →, a notation of Conway chained arrow notation Conway chained arrow notation, created by mathematician John Horton Conway, is a means of expressing certain extremely large numbers. It is simply a finite sequence of positive intege ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arrow (symbol)
An arrow is a graphical symbol, such as ← or →, or a pictogram, used to point or indicate direction. In its simplest form, an arrow is a triangle, chevron, or concave kite, usually affixed to a line segment or rectangle, and in more complex forms a representation of an actual arrow (e.g. ➵ U+27B5). The direction indicated by an arrow is the one along the length of the line or rectangle toward the single pointed end. History An older (medieval) convention is the manicule (pointing hand, 👈). Pedro Reinel in c. 1504 first used the fleur-de-lis as indicating north in a compass rose; the convention of marking the eastern direction with a cross is older (medieval). Use of the arrow symbol does not appear to pre-date the 18th century. An early arrow symbol is found in an illustration of Bernard Forest de Bélidor's treatise ''L'architecture hydraulique'', printed in France in 1737. The arrow is here used to illustrate the direction of the flow of water and of the water w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vector (geometric)
In mathematics, physics, and engineering, a Euclidean vector or simply a vector (sometimes called a geometric vector or spatial vector) is a geometric object that has magnitude (or length) and direction. Vectors can be added to other vectors according to vector algebra. A Euclidean vector is frequently represented by a '' directed line segment'', or graphically as an arrow connecting an ''initial point'' ''A'' with a ''terminal point'' ''B'', and denoted by \overrightarrow . A vector is what is needed to "carry" the point ''A'' to the point ''B''; the Latin word ''vector'' means "carrier". It was first used by 18th century astronomers investigating planetary revolution around the Sun. The magnitude of the vector is the distance between the two points, and the direction refers to the direction of displacement from ''A'' to ''B''. Many algebraic operations on real numbers such as addition, subtraction, multiplication, and negation have close analogues for vectors, operat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
↓ (other)
The arrow symbol ↓ may refer to: * The downward direction, a relative direction * The keyboard cursor control key, an arrow key * A downwards arrow, a Unicode arrow symbol * Logical NOR, operator which produces a result that is the negation of logical OR * An undefined object, in mathematical well-definition * A comma category, in category theory * Down (game theory), a mathematical game * The ingressive sound, in phonetics * An APL function * "Decreased" (and similar meanings), in medical notation * The precipitation of an insoluble solid, in chemical notation See also * Down sign (other) * Arrow (other) ** ↑ (other) ** → (other) → or -> may refer to: * one of the arrow symbols, characters of Unicode * one of the arrow keys, on a keyboard * →, >, representing the assignment operator in various programming languages * ->, a Pointer operator in C and C++ where a->b i ... ** ← (other) {{disambiguation Logic sy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
↑ (other)
The symbol ↑, an upward pointing arrow, also called up arrow, uparrow, or upwards arrow, may refer to: Notation * ↑, a mathematical symbol for "undefined" * ↑, a notation of Knuth's up-arrow notation for very large integers * ↑, a mathematical game theory position ''Up'' * ↑ or Sheffer stroke, the logical connective "not both" or NAND * ↑, the APL function 'take' * "Increased" (and similar meanings), in medical notation * ↑, a chemical symbol for production of gas, which bubbles up. Character representations * ↑, upwards arrow, a Unicode arrow symbol * ↑, ↑, a HTML or XML character entity * ↑, codepoint 8A (hex) in EBCDIC Code page 293, used for writing APL * ↑, the glyph for character 94 (decimal) in ASCII until 1967, when it was replaced by the caret (^). See also * Ꙟ, an archaic Romanian Cyrillic letter * Arrow keys, on computer keyboards * Arrow (other) ** ↓ (other) ** → (other) → or -> may refer to: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arrow (other)
An arrow is a projectile launched from a bow. Arrow or arrows may also refer to: Symbols * Arrow (symbol) ** ↑ (other) ** → (other) ** ↓ (other) ** ← (other) Places * Arrow, Kentucky * Arrow, Warwickshire, England * Arrow River (New Zealand) * River Arrow, Wales * River Arrow, Worcestershire, England People * Arrow (musician) (1949–2010), calypso and soca musician * Gilbert John Arrow (1873–1948), English entomologist * Kenneth Arrow (1921–2017), American economist, joint winner of the 1972 Nobel Prize in Economics Arts, entertainment, and media Fictional entities * Arrow (comics), a superhero character, first appearing in 1938 * The Arrow, a fictional location, the first Dharma Initiative station in the television series ''Lost'' *Arrow, a character from Rudolph the Red-Nosed Reindeer: The Movie. Music Groups and labels * Arrows (Australian band), indie rock band established 2006 * Arrows (British band), 1970s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Media Player (other)
A media player could refer to: * Digital media player, home appliances that play digital media *Media player software, software that plays digital media * Portable media player, portable hardware that plays digital media *Windows Media Player Windows Media Player (WMP) is the first media player (application software), media player and media library application that was developed by Microsoft for playing sound reproduction, audio, video and viewing images on personal computers runnin ..., software that plays digital media included in Windows ** Media Player (Windows 11), Media player software included in Windows 11 replacing Groove Music {{dab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Medical Abbreviations
Abbreviations are used very frequently in medicine. They boost efficiency as long as they are used intelligently. The advantages of brevity should be weighed against the possibilities of obfuscation (making the communication harder for others to understand) and ambiguity (having more than one possible interpretation). Certain medical abbreviations are avoided to prevent mistakes, according to best practices (and in some cases regulatory requirements); these are flagged in the list of abbreviations used in medical prescriptions. Orthographic styling Periods (stops) Periods (stops) are often used in styling abbreviations. Prevalent practice in medicine today is often to forego them as unnecessary. * Example: ** ''Less common:'' The diagnosis was C.O.P.D. hronic obstructive pulmonary disease** ''More common:'' The diagnosis was COPD Plurals The prevalent way to represent plurals for medical acronyms and initialisms is simply to affix a lowercase ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conway Chained Arrow Notation
Conway chained arrow notation, created by mathematician John Horton Conway, is a means of expressing certain extremely large numbers. It is simply a finite sequence of positive integers separated by rightward arrows, e.g. 2\to3\to4\to5\to6. As with most combinatorial notations, the definition is recursive. In this case the notation eventually resolves to being the leftmost number raised to some (usually enormous) integer power. Definition and overview A "Conway chain" is defined as follows: * Any positive integer is a chain of length 1. * A chain of length ''n'', followed by a right-arrow → and a positive integer, together form a chain of length n+1. Any chain represents an integer, according to the six rules below. Two chains are said to be equivalent if they represent the same integer. Let a, b, c denote positive integers and let \# denote the unchanged remainder of the chain. Then: #An empty chain (or a chain of length 0) is equal to 1 #The chain p represents the number p. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Relative Direction
In geometry, a position or position vector, also known as location vector or radius vector, is a Euclidean vector that represents the position of a point ''P'' in space in relation to an arbitrary reference origin ''O''. Usually denoted x, r, or s, it corresponds to the straight line segment from ''O'' to ''P''. In other words, it is the displacement or translation that maps the origin to ''P'': :\mathbf=\overrightarrow The term "position vector" is used mostly in the fields of differential geometry, mechanics and occasionally vector calculus. Frequently this is used in two-dimensional or three-dimensional space, but can be easily generalized to Euclidean spaces and affine spaces of any dimension.Keller, F. J, Gettys, W. E. et al. (1993), p 28–29 Relative position The relative position of a point ''Q'' with respect to point ''P'' is the Euclidean vector resulting from the subtraction of the two absolute position vectors (each with respect to the origin): :\Delta \mathbf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morphism
In mathematics, particularly in category theory, a morphism is a structure-preserving map from one mathematical structure to another one of the same type. The notion of morphism recurs in much of contemporary mathematics. In set theory, morphisms are functions; in linear algebra, linear transformations; in group theory, group homomorphisms; in topology, continuous functions, and so on. In category theory, ''morphism'' is a broadly similar idea: the mathematical objects involved need not be sets, and the relationships between them may be something other than maps, although the morphisms between the objects of a given category have to behave similarly to maps in that they have to admit an associative operation similar to function composition. A morphism in category theory is an abstraction of a homomorphism. The study of morphisms and of the structures (called "objects") over which they are defined is central to category theory. Much of the terminology of morphisms, as well as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arrow Keys
Arrow keys or cursor movement keys are buttons on a computer keyboard that are either programmed or designated to move the cursor in a specified direction. The term "cursor movement key" is distinct from "arrow key" in that the former term may refer to any of various keys on a computer keyboard designated for cursor movement, whereas "arrow keys" generally refers to one of four specific keys, typically marked with arrows. Arrow keys are typically located at the bottom of the keyboard to the left side of the numeric keypad, usually arranged in an inverted-T layout but also found in diamond shapes and linear shapes. Arrow keys are commonly used for navigating around documents and for playing games. The inverted-T layout was popularized by the Digital Equipment Corporation LK201 keyboard from 1982. Historical development Before the computer mouse was widespread, arrow keys were the primary way of moving a cursor on screen. Mouse keys is a feature that allows controlling a mou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Material Conditional
The material conditional (also known as material implication) is an operation commonly used in logic. When the conditional symbol \rightarrow is interpreted as material implication, a formula P \rightarrow Q is true unless P is true and Q is false. Material implication can also be characterized inferentially by modus ponens, modus tollens, conditional proof, and classical reductio ad absurdum. Material implication is used in all the basic systems of classical logic as well as some nonclassical logics. It is assumed as a model of correct conditional reasoning within mathematics and serves as the basis for commands in many programming languages. However, many logics replace material implication with other operators such as the strict conditional and the variably strict conditional. Due to the paradoxes of material implication and related problems, material implication is not generally considered a viable analysis of conditional sentences in natural language. Notati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
