"Λ" redirects here. It is not to be confused with
Look up or Λ in Wiktionary, the free dictionary. λ Lambda (uppercase , lowercase Λ ; λ Greek: Λάμ(β)δα lam(b)da) is the 11th letter of the Greek alphabet. In the system of Greek numerals lambda has a value of 30. Lambda is related to the Phoenician letter Lamed . Letters in other alphabets that stemmed from lambda include the Latin L and the Cyrillic letter El (Л, л). The ancient grammarians and dramatists give evidence to the pronunciation as ( [laːbdaː] λάβδα) in Classical Greek times. In [1 ] Modern Greek the name of the letter, Λάμδα, is pronounced ; the spoken letter itself has the sound of [lamða] [l] as with Latinate "L".
early Greek alphabets, the shape and orientation of lambda varied. Most variants consisted of two straight strokes, one longer than the other, connected at their ends. The angle might be in the upper-left, lower-left ("Western" alphabets), or top ("Eastern" alphabets). Other variants had a vertical line with a horizontal or sloped stroke running to the right. With the general adoption of the [2 ] Ionic alphabet, Greek settled on an angle at the top; the Romans put the angle at the lower-left.
The HTML 4 character entity references for the Greek capital and small letter lambda are "Λ" and "λ", respectively.
The Unicode number for lambda is 03BB. [3 ]
The Greek alphabet on a
vessel, with a Phoenician-lamed-shaped lambda. (The gamma has the shape of modern lambda.)
Symbol [edit ] Upper-case letter Λ [edit ] The lambda particle is a type of subatomic particle in subatomic particle physics. Lambda is the set of logical axioms in the axiomatic method of logical deduction in first-order logic. Lambda was used as a shield pattern by the Spartan Army. This stood for Lakedaimon, the name of the region of Sparta. Lambda is the von Mangoldt function in mathematical number theory. In statistics, Wilks's lambda is used in multivariate analysis of variance ( MANOVA analysis) to compare group means on a combination of dependent variables. In the spectral decomposition of matrices, lambda indicates the diagonal matrix of the eigenvalues of the matrix (mathematics). In computer science, lambda is the time window over which a process is observed for determining the working memory set for a digital computer's virtual memory management. In astrophysics, lambda represents the likelihood that a small body will encounter a planet or a dwarf planet leading to a deflection of a significant magnitude. An object with a large value of lambda is expected to have cleared its neighborhood, satisfying the current definition of a planet. In crystal optics, lambda is used to represent the period of a lattice. In NATO military operations, a chevron (a capital lambda symbol) is painted on the vehicles of this military alliance for identification. In chemistry there are Δ (delta) and Λ (lambda) isomers, see: coordination complex In electrochemistry, lambda denotes the "equivalent conductance" of an electrolyte solution. In cosmology, lambda is the symbol for the cosmological constant. In optics, lambda denotes the grating pitch of a Bragg reflector. In handwritten Russian, this letter represents Л in both uppercase and lowercase formats. Lower-case letter λ [edit ]
This section needs additional citations for . verification (October 2013) In evolutionary algorithms, λ indicates the number of offspring that would be generated from μ current population in each generation. The terms μ and λ are originated from Evolution strategy notation. Lambda indicates the wavelength of any wave, especially in physics, electronics engineering, and mathematics. Lambda indicates the radioactivity decay constant in nuclear physics and radioactivity. This constant is very simply related (by a multiplicative constant) to the half-life of any radioactive material. In probability theory, lambda represents the density of occurrences within a time interval, as modeled by the Poisson distribution. In mathematical logic and computer science, lambda is used to introduce anonymous functions expressed with the concepts of lambda calculus. Lambda is a symbol for one micro liter (1 μL), that is, one cubic millimeter (1 mm 3). This use is currently deprecated. Lambda indicates an eigenvalue in the mathematics of linear algebra. In the physics of electric fields, lambda sometimes indicates the linear charge density of a uniform line of electric charge (measured in coulombs per meter). Lambda denotes a Lagrange multiplier in multi-dimensional calculus. In solid-state electronics, lambda indicates the channel length modulation parameter of a MOSFET. There is a lambda phage virus in biology. In ecology, lambda denotes the long-term intrinsic growth rate of a population. This value is often calculated as the dominant eigenvalue of the age/size class matrix (mathematics). In formal language theory and in computer science, lambda denotes the empty string. In telecommunications, lambda indicates the wavelength in a wavelength-division multiplexing optical communications system. This is actually a form of the long-established concept of frequency-division multiplexing. Lambda denotes the Lebesgue measure in mathematical set theory. The Goodman and Kruskal's lambda in statistics indicates the proportional reduction in error when one variable's values are used to predict the values of another variable. Lambda denotes the oxygen sensor in a vehicle that measures the air-to-fuel ratio in the exhaust gases of an internal-combustion engine. A Lambda 4S solid-fuel rocket was used to launch Japan's first orbital satellite in 1970. [4 ] Lambda denotes the failure rate of devices and systems in reliability theory, and it is measured in failure events per hour. Numerically, this lambda is also the reciprocal of the mean time between failures. In criminology, lambda denotes an individual's frequency of offenses. In cartography and navigation, lambda denotes the longitude of a location. Lambda is the symbol of the musician Richard D. James or Aphex Twin. Lambda denotes Christopher Langton's parameter for the classification of Stephen Wolfram's classes of cellular automata. In electrochemistry, lambda also denotes the ionic conductance of a given ion (The composition of the ion is generally shown as a subscript to the lambda character). In neurobiology, lambda denotes the length constant (or exponential rate of decay) of the electric potential across the cell membrane along a length of a nerve cell's axon. In the science and technology of heat transfer, lambda denotes the heat of vaporization per mole of material (a.k.a. its "latent heat"). [5 ] In the technology and science of celestial navigation, lambda denotes the longitude as opposed to the Roman letter "L", which denotes the latitude. King Louis XIII of France used the letter lambda as his personal symbol rather than monogram. In Volvo automobiles, lambda denotes an engine, fuel, or ignition system failure. A block style Lambda is used as a recurring symbol in the Valve computer game series , referring to the Lambda complex of the fictional Half-Life Black Mesa Research Facility. The lambda was selected as a symbol by the Gay Activists Alliance of New York in 1970, and declared the international symbol for gay and lesbian rights by the International Gay Rights Congress in Edinburgh, Scotland, in 1974. The " lambda sign" is used for diagnosis of dichorionic twins in obstetric ultrasonography Lambda as a programming construct [edit ] >>> list = [ 'woman' , 'man' , 'horse' , 'boat' , 'plane' , 'dog' ] >>> sorted ( list , key = lambda word: (word [- 1 ] ) ) [ 'horse' , 'plane' , 'dog' , 'woman' , 'man' , 'boat' ] In the C# programming language a lambda expression is an anonymous function that can contain expressions and statements. [6 ] The language Unlambda is a functional programming language based upon combinatory logic, a simplification of the lambda calculus that does not involve the lambda at all, hence the un- prefix. An automotive oxygen sensor (O 2 sensor) is also known as a lambda probe, sensor, sond, or sonde. Lambda is used in art and photography to refer to a digital Type C print, or to the equipment that is used to produce it. Lambda was used by Pythagoras to denote the "Lambda number sequence" 1, 2, 3, 4, 9, 8, 27, ...,(sequence in A098293 OEIS) formed by the integers of the form 2 and 3 i , for nonnegative integer i i. In the study of gasoline engines, Lambda sometimes refers to the air/fuel mixture going into the engine. Lambda as a name [edit ] Stargate SG-1 uses a modified upper-case lambda, with a small circle above the apex, to indicate Earth. This symbol has since become associated with the entire franchise. [7 ] [8 ] The popular science fiction universe of uses a transport vehicle known as the Star Wars Lambda-class shuttle that when viewed forward has the shape of the lowercase lambda. [9 ] Lambda is occasionally used in graphic design to represent a stylised 'A'. Examples include the Disney movie , the logo of the band Atlantis: The Lost Empire , the logo of the band Angels & Airwaves , the logo of electronics company Dream Theater Samsung, and the logo of the engineering consultancy Atkins. Conversely, the name of the band (pronounced Λucifer lucifer) is sometimes spelled Aucifer. The upper-case lambda is used as the alias of Providence, Rhode Island based musician Xavier Valentine. [10 ] The Half-Life franchise of video games uses an encircled block style lower-case lambda as the franchise logo ( Half-Life 2 adds the numeral 2 into the logo as superscript), prominently featured on the chest of Gordon Freeman's (the protagonist) powered armor, known as an HEV suit. In the first game, the logo appears at the entrances of the Black Mesa Research Facility's Lambda Complex, which conducted teleportation research. In Half-Life 2 and its Episodes, the encircled block lambda is the universal symbol of the Resistance, often spraypainted to mark the location of safehouses and hidden supply caches; full-time Resistance members wear armbands containing a lower-case lambda without the circle. In the 2D fighting game series , a recurring character named Lambda-11 appears in the various games' story modes and as a playable character. BlazBlue Several gay rights organizations, such as Lambda Legal and the Lambda Literary Award derive their names from the use of a lower-case lambda as a symbol for gay and lesbian rights. In the RPG game Tales of Graces, originally made for the Wii, Lambda is the name of the main story's antagonist. There is a PlayStation Vita game known as Cytus Lambda. Character Encodings [edit ]
Unicode uses the spelling "lamda" in character names, instead of "lambda".
Greek Lambda / Coptic Laula
Character Λ λ ᴧ Ⲗ ⲗ Unicode name GREEK CAPITAL LETTER LAMDA GREEK SMALL LETTER LAMDA GREEK LETTER SMALL CAPITAL LAMDA COPTIC CAPITAL LETTER LAULA COPTIC SMALL LETTER LAULA Encodings decimal hex decimal hex decimal hex decimal hex decimal hex Unicode 923 U+039B 955 U+03BB 7463 U+1D27 11414 U+2C96 11415 U+2C97 UTF-8 206 155 CE 9B 206 187 CE BB 225 180 167 E1 B4 A7 226 178 150 E2 B2 96 226 178 151 E2 B2 97 Numeric character reference Λ Λ λ λ ᴧ ᴧ Ⲗ Ⲗ ⲗ ⲗ Named character reference Λ λ DOS Greek 138 8A 162 A2 DOS Greek-2 182 B6 229 E5 Windows 1253 203 CB 235 EB TeX \Lambda \lambda
Character 𝚲 𝛌 𝛬 𝜆 𝜦 𝝀 Unicode name MATHEMATICAL BOLD CAPITAL LAMDA MATHEMATICAL BOLD SMALL LAMDA MATHEMATICAL ITALIC CAPITAL LAMDA MATHEMATICAL ITALIC SMALL LAMDA MATHEMATICAL BOLD ITALIC CAPITAL LAMDA MATHEMATICAL BOLD ITALIC SMALL LAMDA Encodings decimal hex decimal hex decimal hex decimal hex decimal hex decimal hex Unicode 120498 U+1D6B2 120524 U+1D6CC 120556 U+1D6EC 120582 U+1D706 120614 U+1D726 120640 U+1D740 UTF-8 240 157 154 178 F0 9D 9A B2 240 157 155 140 F0 9D 9B 8C 240 157 155 172 F0 9D 9B AC 240 157 156 134 F0 9D 9C 86 240 157 156 166 F0 9D 9C A6 240 157 157 128 F0 9D 9D 80 UTF-16 55349 57010 D835 DEB2 55349 57036 D835 DECC 55349 57068 D835 DEEC 55349 57094 D835 DF06 55349 57126 D835 DF26 55349 57152 D835 DF40 Numeric character reference 𝚲 𝚲 𝛌 𝛌 𝛬 𝛬 𝜆 𝜆 𝜦 𝜦 𝝀 𝝀
Character 𝝠 𝝺 𝞚 𝞴 Unicode name MATHEMATICAL SANS-SERIF BOLD CAPITAL LAMDA MATHEMATICAL SANS-SERIF BOLD SMALL LAMDA MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL LAMDA MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL LAMDA Encodings decimal hex decimal hex decimal hex decimal hex Unicode 120672 U+1D760 120698 U+1D77A 120730 U+1D79A 120756 U+1D7B4 UTF-8 240 157 157 160 F0 9D 9D A0 240 157 157 186 F0 9D 9D BA 240 157 158 154 F0 9D 9E 9A 240 157 158 180 F0 9D 9E B4 UTF-16 55349 57184 D835 DF60 55349 57210 D835 DF7A 55349 57242 D835 DF9A 55349 57268 D835 DFB4 Numeric character reference 𝝠 𝝠 𝝺 𝝺 𝞚 𝞚 𝞴 𝞴
These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.
See also [edit ] References [edit ] ^ Herbert Weir Smyth. A Greek Grammar for Colleges. I.1.c ^ "Epigraphic Sources for Early Greek Writing". Poinikastas.csad.ox.ac.uk . Retrieved 2011-10-03. ^ World Wide Web Consortium W3C. HTML 4.01 Specification, 24. Character entity references in HTML 4.  ^ "Encyclopedia Astronautica: Lambda". www.astronautix.com . Retrieved 2012-12-18. ^ Wankat Separation Process Engineering 2nd ed, Prentice Hall ^ "Lambda Expressions (C# Programming Guide)". Msdn.microsoft.com . Retrieved 2011-10-03. ^ Read, David (July 15, 2010). "Earth Symbol". Propworx . Retrieved 2010-10-12. ^ "Official Stargate Website". Metro-Goldwyn-Mayer . Retrieved 2010-10-13. ^ "Imperial Lambda-class shuttle". Star Wars Databank. Lucasfilm . Retrieved 2010-10-12. ^ "Ʌ". Aarrcc.bandcamp.com . Retrieved 2011-10-03.