• Loew, Marcus (American executive)

    Marcus Loew was an American motion-picture executive and pioneer motion-picture theatre owner whose consolidation and expansion of his business interests helped establish Hollywood as the centre of the film industry. Loew was the son of an Austrian immigrant and left school at the age of nine to

  • Loewe v. Lawlor (208 U.S. 274) (law case, United States)

    Danbury Hatters’ Case, U.S. Supreme Court case in which unions were held to be subject to the antitrust laws. In 1902 the United Hatters of North America, having failed to organize the firm of D.E. Loewe in Danbury, Conn., called for a nationwide boycott of the firm’s products. The firm brought

  • Loewe, Carl (German composer)

    Carl Loewe was a German composer and singer who is best-known for his songs, particularly his dramatic ballads. Loewe began to compose while still a choirboy in Köthen and completed his musical training in Halle. He frequently toured Europe singing his songs with great success, and in Vienna he was

  • Loewe, Frederick (American composer)

    Frederick Loewe was a German-born American composer and collaborator with Alan Jay Lerner on a series of hit musical plays, including the phenomenally successful My Fair Lady (1956; filmed 1964). Loewe, whose father was a Viennese actor and operetta tenor, was a child prodigy, playing the piano at

  • Loewe, H. (Jewish scholar)

    Claude Joseph Goldsmid Montefiore: …collaborated with the Orthodox scholar, H. Loewe, in editing A Rabbinic Anthology. This work is doubly remarkable because Reform Jews deny the authority of the Talmud, the rabbinical compendium of law, lore, and commentary. In the Anthology, Montefiore attempts to dispel the notion that Christianity developed a completely new and…

  • Loewe, Johann Carl Gottfried (German composer)

    Carl Loewe was a German composer and singer who is best-known for his songs, particularly his dramatic ballads. Loewe began to compose while still a choirboy in Köthen and completed his musical training in Halle. He frequently toured Europe singing his songs with great success, and in Vienna he was

  • Loewenstein, László (Hungarian-American actor)

    Peter Lorre was a Hungarian-born American motion-picture actor who projected a sinister image as a lisping, round-faced, soft-voiced villain in thrillers. A player of bit parts with a German theatrical troupe from 1921, Lorre achieved international fame as the psychotic child murderer in the German

  • Loewi, Otto (German-American pharmacologist)

    Otto Loewi was a German-born American physician and pharmacologist who, with Sir Henry Dale, received the Nobel Prize for Physiology or Medicine in 1936 for their discoveries relating to the chemical transmission of nerve impulses. After Loewi graduated in medicine (1896) from the German University

  • Loewy, Raymond (American industrial designer)

    Raymond Loewy was a French-born American industrial designer who, through his accomplishments in product design beginning in the 1930s, helped to establish industrial design as a profession. Loewy studied electrical engineering at the University of Paris, graduating in 1910. His studies in advanced

  • Loewy, Raymond Fernand (American industrial designer)

    Raymond Loewy was a French-born American industrial designer who, through his accomplishments in product design beginning in the 1930s, helped to establish industrial design as a profession. Loewy studied electrical engineering at the University of Paris, graduating in 1910. His studies in advanced

  • Loewy, Salomon (Austrian composer)

    Salomon Sulzer was an Austrian Jewish cantor, considered the most important composer of synagogue music in the 19th century. Sulzer was trained in cantorial singing from childhood, studying in Austria and Switzerland and travelling in France. In 1820 he was appointed cantor at Hohenems and served

  • Löffler, Friedrich August Johannes (German bacteriologist)

    Friedrich August Johannes Löffler was a German bacteriologist who, with Edwin Klebs, in 1884 discovered the organism that causes diphtheria, Corynebacterium diphtheriae, commonly known as the Klebs-Löffler bacillus. Simultaneously with Émile Roux and Alexandre Yersin, he indicated the existence of

  • Lofgren, Nils (American musician)

    Bruce Springsteen: Springsteen’s political messaging: …Bittan, bassist Garry Tallent, guitarist Nils Lofgren, vocalist Patti Scialfa (Springsteen’s wife), and two former E Street Band band members, pianist David Sancious and drummer Vini Lopez—were selected in 2013 for induction into the Rock and Roll Hall of Fame as members of the E Street Band.

  • Lofi Girl (Fench YouTube channel)

    lo-fi music: On YouTube the channel Lofi Girl, started in 2017 as ChilledCow, features a continuous live stream of lo-fi music. The video on-screen plays a repeating animation loop of a young woman, drawn in the style of anime, studying in her bedroom while her cat naps peacefully on her windowsill.…

  • lofi music

    lo-fi music, genre of music production in which a recording is intentionally rendered to include imperfections, such as harmonic distortion, background noise, or other anomalous sounds. Such irregularities are normally filtered out of professional recordings, since they generally are undesirable.

  • Lofoten (islands, North Sea)

    Lofoten, island group, in the Norwegian Sea, northern Norway. Lying off the mainland entirely within the Arctic Circle, the group comprises the southern end of the Lofoten-Vesterålen archipelago and includes five main islands (Austvågøya, Gimsøya, Vestvågøya, Flakstadøya, and Moskenesøya) extending

  • loft (architecture)

    loft, in architecture, upper space within a building, or a large undivided space in a building used principally for storage in business or industry. In churches the rood loft is a display gallery above the rood screen, and a choir or organ loft is a gallery reserved for church singers and

  • lofted shot (cricket)

    cricket: Technical development: …no fielders there) and the lofted shot (where the batsman tries to hit the ball past the fielders and over their heads). Twenty20 (T20), a style of one-day cricket consisting of 20 overs per side, debuted in 2003 and quickly became an international sensation. The first Twenty20 world championship was…

  • Lofthuus, Christian Jensen (Norwegian peasant leader)

    Christian Jensen Lofthuus was a leader of a reform movement who sought redress for the grievances of Norway’s peasantry from the absolutist Danish-Norwegian government. His imprisonment and death made him a martyr for Norwegian agrarian reform. Lofthuus first journeyed to Denmark in June 1786 to

  • Lofting, Hugh (British-American author)

    Hugh Lofting was an English-born American author of a series of children’s classics about Dr. Dolittle, a chubby, gentle, eccentric physician to animals, who learns the language of animals from his parrot, Polynesia, so that he can treat their complaints more efficiently. Much of the wit and charm

  • Lofton, Martha Euphemia (American educator and mathematician)

    Euphemia Lofton Haynes was an American educator and mathematician who was the first African American woman to receive a doctoral degree in mathematics. Lofton was born into a socially prominent African American family. Her father, William, was a dentist, and her mother, Lavinia, was a kindergarten

  • Lofton, Ramona (American author)

    Sapphire is an American author of fiction and poetry that features unsparing though often empowering depictions of the vicissitudes of African American and bisexual life. Lofton, whose father was a U.S. Army sergeant and whose mother was a member of the Women’s Army Corps (WAC), spent portions of

  • Loftus, William Kenneth (British archaeologist)

    Susa: Loftus, consists of four mounds. One held the citadel and was excavated (1897–1908) by Jacques de Morgan, who uncovered, among other objects, the obelisk of the Akkadian king Manishtusu, the stele of his successor Naram-Sin, and the code of Hammurabi of Babylon. A second mound…

  • Löfven, Stefan (prime minister of Sweden)

    Stefan Löfven is a Swedish labour leader and Social Democratic politician who served as prime minister of Sweden (2014–21). Löfven grew up as foster child in a working-class family in Ådalen, Västernorrland, in northeastern Sweden. He studied social work at Umeå University for a year and a half and

  • log (ancient unit of measurement)

    measurement system: The Babylonians: gallons); if so, the log equaled slightly more than 0.5 litre (0.14 U.S. gallon), and the hin slightly more than 6 litres (1.6 U.S. gallons). The Hebrew system was notable for the close relationship between dry and liquid volumetric measures; the liquid kor was the same size as the…

  • log (nautical instrument)

    log, instrument for measuring the speed of a ship through water. The first practical log, developed about 1600, consisted of a pie-shaped log chip with a lead weight on its curved edge that caused it to float upright and resist towing. When the log was tossed overboard, it remained more or less

  • log (wood)

    road: The Amber Routes: …two or three strings of logs in the direction of the road on a bed of branches and boughs up to 20 feet (6 metres) wide. This layer was then covered with a layer of transverse logs 9 to 12 feet in length laid side by side. In the best…

  • log cabin (building)

    log cabin, small house built of logs notched at the ends and laid one upon another with the spaces filled with plaster, moss, mortar, mud, or dried manure. Log cabins are found especially in wooded areas, where the construction material is easily at hand. In North America they were built by early

  • log fern (fern genus)

    shield fern, any of about 250 species of the fern genus Dryopteris, in the family Dryopteridaceae, with worldwide distribution. Shield ferns are medium-sized woodland plants with bright green, leathery leaves that are several times divided. They have numerous round spore clusters (sori) attached

  • log glass (time-measuring device)

    hourglass, an early device for measuring intervals of time. It is also known as a sandglass or a log glass when used in conjunction with the common log for ascertaining the speed of a ship. It consists of two pear-shaped bulbs of glass, united at their apexes and having a minute passage formed

  • log line (surveying)

    surveying: History: …Greeks used a form of log line for recording the distances run from point to point along the coast while making their slow voyages from the Indus to the Persian Gulf about 325 bce. The magnetic compass was brought to the West by Arab traders in the 12th century ce.…

  • log phase (biology)

    bacteria: Growth of bacterial populations: The population then enters the log phase, in which cell numbers increase in a logarithmic fashion, and each cell generation occurs in the same time interval as the preceding ones, resulting in a balanced increase in the constituents of each cell. The log phase continues until nutrients are depleted or…

  • log road

    road: The Amber Routes: A few remnants of these roads survive today. They were constructed by laying two or three strings of logs in the direction of the road on a bed of branches and boughs up to 20 feet (6 metres) wide. This layer was then covered with a layer of transverse logs…

  • log-cock (bird)

    pileated woodpecker, (Dryocopus pileatus), species of large nonmigratory woodpecker known for its black plumage, red crest, and bold white stripes on the face and neck. It is the largest living woodpecker in North America. Only the ivory-billed woodpecker (Campephilus principalis) and the imperial

  • log-log slide rule (mathematics)

    Peter Mark Roget: …1814 he invented a “log-log” slide rule for calculating the roots and powers of numbers. From 1808 to 1840 he practiced in London. The first edition of the Thesaurus, which was begun in his 61st year and finished in his 73rd, was a product of his retirement from active medical…

  • Logan (film by Mangold [2017])

    Hugh Jackman: Later roles: In 2017 Jackman starred in Logan, the 10th film in which he appeared as Wolverine, and later that year he portrayed P.T. Barnum in the musical The Greatest Showman. He then starred in The Front Runner (2018), the true story of former U.S. senator Gary Hart, whose 1988 presidential bid…

  • Logan (Utah, United States)

    Logan, city, seat (1859) of Cache county, northern Utah, U.S. It lies along the Logan River (named for Ephraim Logan, a trapper), in the Cache Valley, 35 miles (56 km) north-northeast of Ogden. The city is built on terraces of prehistoric Lake Bonneville at the mouth of Logan Canyon, 4,535 feet

  • Logan (West Virginia, United States)

    Logan, city, seat (1826) of Logan county, southwestern West Virginia, U.S. It lies along the Guyandotte River, about 40 miles (64 km) southwest of Charleston, near the Kentucky border. Laid out in 1824 and known as Lawnsville, it was chartered in 1852 and renamed Aracoma for the eldest daughter of

  • Logan Act (United States [1799])

    Logan Act, legislation enacted by the United States Congress (1799) that forbids private citizens from engaging in unauthorized correspondence with foreign governments. As amended, the act reads: During the 1790s tensions were high between the United States and France. In 1778 France had formally

  • Logan Lucky (film by Soderbergh [2017])

    Daniel Craig: Other work in theater and film: …in Steven Soderbergh’s comedy heist Logan Lucky and portrayed the neighbor and love interest of a foster mother living in Los Angeles during the riots of 1992 in Kings. In the comedic whodunit Knives Out (2019), he was cast as a detective investigating the death of a mystery writer; he…

  • Logan Stone (poetry by Thomas)

    D.M. Thomas: In his first poetry collection, Logan Stone (1971), he explored subjects that ranged from eroticism to science fiction to his native Cornwall, all of which became common themes of his work. His later collections, including The Shaft (1973), Love and Other Deaths (1975), and The Honeymoon Voyage (1978), won praise…

  • Logan’s Fault (geological feature, North America)

    Logan’s Line, in geology, prominent zone of thrust faulting in northeastern and eastern North America related to the culmination of the Taconic orogeny during the Ordovician Period (488.3 million to 443.7 million years ago). The zone parallels the coast of Newfoundland, follows the St. Lawrence

  • Logan’s Line (geological feature, North America)

    Logan’s Line, in geology, prominent zone of thrust faulting in northeastern and eastern North America related to the culmination of the Taconic orogeny during the Ordovician Period (488.3 million to 443.7 million years ago). The zone parallels the coast of Newfoundland, follows the St. Lawrence

  • Logan, Harvey (American outlaw)

    Kid Curry was an American gunslinger who became notorious as the most quick-tempered killer of the Wild Bunch, a group of Western outlaws. His brothers, Lonny and Johnny, also gained reputations as Western badmen, as did their uncle, George Sutherland (“Flat Nose”) Curry. Kid Curry, primarily a

  • Logan, James (American Indian leader)

    James Logan was a prominent Indian leader, whose initial excellent relations with white settlers in Pennsylvania and the Ohio Territory deteriorated into a vendetta after the slaughter of his family in 1774. Logan’s mother was a Cayuga Indian; his father was Chief Shikellamy, who was purportedly a

  • Logan, James (British-American colonial statesman)

    James Logan was a British-American colonial statesman and merchant who was also prominent in British-colonial intellectual life. After receiving instruction in classical and modern languages from his schoolmaster father, Logan worked in commerce in Bristol, Eng., prior to becoming secretary to

  • Logan, John (Scottish poet)

    John Logan was a Scottish poet and preacher best known for his part in a controversy that arose posthumously over the authorship of a poem entitled “Ode to the Cuckoo,” which some claimed was written by Michael Bruce. Logan attended the University of Edinburgh and completed studies for the

  • Logan, John (American Indian leader)

    James Logan was a prominent Indian leader, whose initial excellent relations with white settlers in Pennsylvania and the Ohio Territory deteriorated into a vendetta after the slaughter of his family in 1774. Logan’s mother was a Cayuga Indian; his father was Chief Shikellamy, who was purportedly a

  • Logan, John A. (United States general and politician)

    John A. Logan was a U.S. politician, Union general during the American Civil War (1861–65), and author who played a pivotal role in the creation of Memorial Day. Logan served in both the U.S. House of Representatives and the Senate and was a candidate for vice president. The namesake son of a

  • Logan, John Alexander (United States general and politician)

    John A. Logan was a U.S. politician, Union general during the American Civil War (1861–65), and author who played a pivotal role in the creation of Memorial Day. Logan served in both the U.S. House of Representatives and the Senate and was a candidate for vice president. The namesake son of a

  • Logan, Joshua (American director and producer)

    Joshua Logan was an American stage and motion-picture director, producer, and writer. Best known as the stage director who brought to Broadway such classics as Charley’s Aunt (1940), Annie Get Your Gun (1946), Mister Roberts (1948), South Pacific (1949), and Fanny (1954)—the last three of which he

  • Logan, Joshua Lockwood, III (American director and producer)

    Joshua Logan was an American stage and motion-picture director, producer, and writer. Best known as the stage director who brought to Broadway such classics as Charley’s Aunt (1940), Annie Get Your Gun (1946), Mister Roberts (1948), South Pacific (1949), and Fanny (1954)—the last three of which he

  • Logan, Lara (British journalist)

    60 Minutes: Bob Simon, Steve Kroft, Lara Logan, Anderson Cooper, Norah O’Donnell, and Jon Wertheim.

  • Logan, Mount (mountain, Yukon, Canada)

    Mount Logan, mountain, highest point (19,551 feet [5,959 meters]) in Canada and second highest in North America (after Mount McKinley [Denali] in the U.S. state of Alaska). It is located in the St. Elias Mountains of southwestern Yukon. The peak towers about 14,000 feet (4,300 meters) above the

  • Logan, Patrick (Australian explorer)

    McPherson Range: In 1827 Captain Patrick Logan became the first European to explore the interior of the range, which was named for Major Duncan McPherson.

  • Logan, Sir William Edmond (Welsh-Canadian geologist)

    Sir William Edmond Logan was one of the foremost Canadian geologists of the 19th century. Logan was educated at the University of Edinburgh and began working for his uncle in London in 1818. From 1831 until 1838 he managed his uncle’s coal and copper-smelting interests in Swansea, Glamorganshire,

  • loganberry (plant)

    loganberry, (Rubus loganobaccus), species of bramble of the rose family (Rosaceae) that originated in Santa Cruz, California, in 1881. Raised from seed by James Harvey Logan, a lawyer and amateur horticulturist, the plant is thought to be a hybrid between the wild blackberry (Rubus ursinus) of the

  • Loganiaceae (plant family)

    Loganiaceae, family of flowering plants in the order Gentianales, containing 13 genera with more than 400 species of woody vines, shrubs, or trees native primarily to tropical areas of the world. Members of the family bear leaflike appendages at the base of the leafstalks and have terminal flower

  • logarithm (mathematics)

    logarithm, the exponent or power to which a base must be raised to yield a given number. Expressed mathematically, x is the logarithm of n to the base b if bx = n, in which case one writes x = logb n. For example, 23 = 8; therefore, 3 is the logarithm of 8 to base 2, or 3 = log2 8. In the same

  • logarithmic spiral (mathematics)

    spiral: The logarithmic, or equiangular, spiral was discovered by the French scientist René Descartes in 1638. In 1692 the Swiss mathematician Jakob Bernoulli named it spira mirabilis (“miracle spiral”) for its mathematical properties; it is carved on his tomb. The general equation of the logarithmic spiral is…

  • Logau, Friedrich von (German writer)

    Friedrich von Logau was a German epigrammatist noted for his direct unostentatious style. Logau was of noble descent and became an orphan early. He spent his life in service to the petty courts of Brieg and Liegnitz. Logau resented the forced lowliness of his position, and he directed much of his

  • Loge at the Théâtre des Italiens, A (painting by Gonzalès)

    Eva Gonzalès: Her painting A Loge at the Théâtre des Italiens (1874), in particular, drew that comparison. The composition features a man and woman (modeled by Gonzalès’s sister Jeanne with engraver Henri Guérard, whom Eva later married) in a lush box at the opera. Her depiction of the figures…

  • Loges, François des (French poet)

    François Villon was one of the greatest French lyric poets. He was known for his life of criminal excess, spending much time in prison or in banishment from medieval Paris. His chief works include Le Lais (Le Petit Testament), Le Grand Testament, and various ballades, chansons, and rondeaux.

  • loggerhead (turtle)

    sea turtle: Physical features and feeding habits: Loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtles have adult shell lengths between 0.9 and 1.2 metres (3 and 4 feet) long. The loggerhead is carnivorous and prefers coastal marine environments. It has the proportionately largest head of the sea turtles; this feature may…

  • loggerhead shrike (bird)

    shrike: …is the similar but smaller loggerhead shrike (L. ludovicianus) of North America. Several Eurasian species have reddish or brown markings.

  • loggia (architecture)

    loggia, room, hall, gallery, or porch open to the air on one or more sides; it evolved in the Mediterranean region, where an open sitting room with protection from the sun was desirable. Ancient Egyptian houses often had a loggia on their roofs or an interior loggia facing upon a court. In medieval

  • Loggia, Robert (American actor and director)

    Irvin Kershner: From B-24s to Laura Mars: Charles Bronson, James Woods, Robert Loggia, and Yaphet Kotto. The erotic thriller Eyes of Laura Mars (1978) would develop a minor cult following that counterbalanced its initial tepid reception; it featured Faye Dunaway as a photographer specializing in sexually provocative fashion layouts.

  • logging (forestry)

    logging, process of harvesting trees, sawing them into appropriate lengths (bucking), and transporting them (skidding) to a sawmill. The different phases of this process vary with local conditions and technology. In the 19th century logging was a hand process, and in some parts of the world it has

  • Loggins and Messina (American musical duo)

    Buffalo Springfield: …in Poco, to Messina in Loggins and Messina (formed with Kenny Loggins), to Young in a prodigious solo career, and to Stills in Crosby, Stills and Nash, which at times also included Young. Stills, Young, and Furay reunited in the 21st century for a number of benefit concerts and music…

  • Loggins, Kenny (American musician)

    Michael McDonald: Career: Elton John, Rickie Lee Jones, Kenny Loggins (with whom he wrote “What a Fool Believes”), Joni Mitchell, and the Pointer Sisters.

  • logia (biblical criticism)

    logia, (Greek: “sayings,” “words,” or “discourses”), hypothetical collection, either written or oral, of the sayings of Jesus, which might have been in circulation around the time of the composition of the Synoptic Gospels (i.e., those of Matthew, Mark, and Luke). Most biblical scholars agree that

  • Logic (work by Bain)

    Alexander Bain: …and a two-volume work on Logic (1870) containing a detailed account of the application of logic to the natural sciences. He also devoted himself to the study of psychology, adopting a rigorously scientific approach. Bain sought to find physical correlatives for such abstract concepts as “idea” and “mind” and stressed…

  • logic

    logic, the study of correct reasoning, especially as it involves the drawing of inferences. This article discusses the basic elements and problems of contemporary logic and provides an overview of its different fields. For treatment of the historical development of logic, see logic, history of. For

  • logic bomb (computer science)

    information system: Computer crime and abuse: A logic bomb consists of hidden instructions, often introduced with the Trojan horse technique, that stay dormant until a specific event occurs, at which time the instructions are activated. In one well-known case, in 1985 a programmer at an insurance company in Fort Worth, Texas, placed…

  • logic design (computer technology)

    logic design, basic organization of the circuitry of a digital computer. All digital computers are based on a two-valued logic system—1/0, on/off, yes/no (see binary code). Computers perform calculations using components called logic gates (or logic circuits), which are made up of integrated

  • logic gate (electronics)

    semiconductor device: Metal-semiconductor field-effect transistors: The third electrode, the gate, forms a rectifying metal-semiconductor contact with the channel. The shaded area underneath the gate electrode is the depletion region of the metal-semiconductor contact. An increase or decrease of the gate voltage with respect to the source causes the depletion region to expand or shrink;…

  • logic of appropriateness

    logic of appropriateness, a view of action that involves the matching of situations, roles, and rules. The logic of appropriateness defines a basis for decision making biased toward what social norms deem right rather than what cost-benefit calculations consider best. Behaviour in a specific

  • logic of belief

    applied logic: Epistemic logic: …to other persons’ knowledge or belief. The other, called “internal,” deals with an agent’s own knowledge or belief. An epistemic logic of the latter kind is also called an autoepistemic logic.

  • Logic of Chance, The (work by Venn)

    John Venn: In The Logic of Chance (1866) Venn presented the first systematic formulation of the frequency theory of probability, according to which statements of the probability of an event are predictions of the frequency with which events of that type will occur in the long run, rather…

  • Logic of Collective Action: Public Goods and the Theory of Groups, The (work of Olson)

    free riding: …riding was articulated analytically in The Logic of Collective Action: Public Goods and the Theory of Groups (1965) by the American political economist Mancur Olson. Relying on an instrumental conception of rationality, according to which rational individuals make choices that they believe will bring about the outcomes they most prefer,…

  • logic of consequences

    logic of appropriateness: …is commonly distinguished from the logic of consequences. The latter evokes self-interested rational actors with fixed preferences and identities whose behaviour is determined by the calculation of expected returns from alternative choices. Although the two logics are usually presented in mutually exclusive terms, they can also be understood as opposite…

  • logic of industrialization (theory by Kerr)

    social change: Economic processes: …of these theories, the “logic of industrialization” thesis by the American scholar Clark Kerr and his colleagues, states that industrialization everywhere, including in the mid-20th-century communist countries, has similar consequences.

  • Logic of Modern Physics, The (work by Bridgman)

    Percy Williams Bridgman: …in his first philosophical book, The Logic of Modern Physics (1927, reprinted 1960). He defined physical concepts (e.g., length) in terms of the operations, both physical and mental, involved in their measurement. Since all measurements are relative to the frame of reference of the observer, concepts are also relative; length,…

  • logic of propositions

    history of logic: Syllogisms: …to what is called the logic of propositions. Aristotle’s logic is, by contrast, a logic of terms in the sense described above. A sustained study of the logic of propositions came only after Aristotle.

  • logic of quantifiers (logic)

    predicate calculus, that part of modern formal or symbolic logic which systematically exhibits the logical relations between sentences that hold purely in virtue of the manner in which predicates or noun expressions are distributed through ranges of subjects by means of quantifiers such as “all”

  • logic of questions

    applied logic: Logic of questions and answers: The logic of questions and answers, also known as erotetic logic, can be approached in different ways. The most general approach treats it as a branch of epistemic logic. The connection is mediated by what are known as the “desiderata”…

  • Logic of Scientific Discovery, The (work by Popper)

    positivism: The verifiability criterion of meaning and its offshoots: …his Logik der Forschung (1935; The Logic of Scientific Discovery), insisted that the meaning criterion should be abandoned and replaced by a criterion of demarcation between empirical (scientific) and transempirical (nonscientific, metaphysical) questions and answers—a criterion that, according to Popper, is to be testability, or, in his own version, falsifiability—i.e.,…

  • logic of terms

    history of logic: Aristotle: Aristotle’s logic was a term logic in the sense that it focused on logical relations between such terms in valid inferences.

  • logic programming language (computing)

    computer programming language: Declarative languages: Logic programming languages, of which PROLOG (programming in logic) is the best known, state a program as a set of logical relations (e.g., a grandparent is the parent of a parent of someone). Such languages are similar to the SQL database language. A program is…

  • logic puzzle (game)

    logic puzzle, puzzle requiring the use of the process of logical deduction to solve. Many challenging questions do not involve numerical or geometrical considerations but call for deductive inferences based chiefly on logical relationships. Such puzzles are not to be confounded with riddles, which

  • Logic Theorist (computer program)

    Allen Newell: …the first AI programs, the Logic Theorist. Funded primarily by the air force and run on Johnniac (a computer named for John von Neumann, one of the inventors of the digital computer), the Logic Theorist was capable of solving general logic problems, such as those found in the Principia Mathematica…

  • logic translation (logic)

    logic: Logical notation: …between the two, known as logic translation, is thus not a trivial one. The reasons for this difficulty are similar to the reasons why it is difficult to program a computer to interpret or express sentences in a natural language.

  • Logic Without Metaphysics (work by Nagel)

    Ernest Nagel: In Logic Without Metaphysics (1957) he defended a naturalistic interpretation of logic, denying the ontological necessity of logico-mathematical principles and arguing that they must be understood according to their function in specific inquiries. The Structure of Science (1961) analyzes the nature of explanation, the logic of…

  • logic, history of

    history of logic, the history of the discipline from its origins among the ancient Greeks to the present time. There was a medieval tradition according to which the Greek philosopher Parmenides (5th century bce) invented logic while living on a rock in Egypt. The story is pure legend, but it does

  • logic, many-valued

    many-valued logic, Formal system in which the well-formed formulae are interpreted as being able to take on values other than the two classical values of truth or falsity. The number of values possible for well-formed formulae in systems of many-valued logic ranges from three to uncountably

  • logic, philosophy of

    philosophy of logic, the study, from a philosophical perspective, of the nature and types of logic, including problems in the field and the relation of logic to mathematics and other disciplines. The term logic comes from the Greek word logos. The variety of senses that logos possesses may suggest

  • logic, theorem of

    formal logic: Natural deduction method in PC: Such a wff is a theorem of logic. It can be shown that those theorems derivable by the rules stated above—together with the definition of α ≡ β as (α ⊃ β) · (β ⊃ α)—are precisely the valid wffs of PC. A set of natural deduction rules yielding as…

  • Logic: or, The Art of Thinking (treatise by Arnauld and Nicole)

    Pierre Nicole: Nicole was an influential spokesman from 1655 to 1668 through his writing or editing of most of the Jansenist pamphlets. He was probably the source of the celebrated distinction between the two “questions of fact,” an adroit device allowing him to separate into two parts…

  • Logica ‘Ingredientibus’  (work by Saint Anselm)

    history of logic: St. Anselm and Peter Abelard: …on some writings of Boethius), Logica “Ingredientibus,” and Logica “Nostrorum petitioni sociorum” (on the Isagoge only), together with the independent treatise Dialectica (extant in part). These works show a familiarity with Boethius but go far beyond him. Among the topics discussed insightfully by Abelard are the role of the copula…

  • Logica ‘Nostrorum petitioni sociorum’  (work by Saint Anselm)

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