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Tit-for-tat
Tit for tat is an English saying meaning "equivalent retaliation". It is an alternation (linguistics), alternation of ''wikt:tip#Noun 3, tip for wikt:tap#Verb 2, tap'' "blow for blow", first recorded in 1558. It is also a highly effective strategy in game theory. An intelligent agent, agent using this strategy will first cooperate, then subsequently replicate an opponent's previous action. If the opponent previously was cooperative, the agent is cooperative. If not, the agent is not. This is similar to reciprocal altruism in biology. Game theory Tit-for-tat has been very successfully used as a strategy for the iterated prisoner's dilemma. The strategy was first introduced by Anatol Rapoport in Robert Axelrod (political scientist), Robert Axelrod's two tournaments, held around 1980. Notably, it was (on both occasions) both the simplest strategy and the most successful in direct competition. Few have extended the game theoretical approach to other applications such as finance. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reciprocal Altruism
In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar manner at a later time. The concept was initially developed by Robert Trivers to explain the evolution of cooperation as instances of mutually altruistic acts. The concept is close to the strategy of " tit for tat" used in game theory. In 1987, Trivers presented at a symposium on reciprocity, noting that he initially titled his article "The Evolution of Delayed Return Altruism," but reviewer W. D. Hamilton suggested renaming it "The Evolution of Reciprocal Altruism." While Trivers adopted the new title, he retained the original examples, causing confusion about reciprocal altruism for decades. Rothstein and Pierotti (1988) addressed this issue at the symposium, proposing new definitions that clarified the concepts. They argued that Delayed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Troubles
The Troubles () were an ethno-nationalist conflict in Northern Ireland that lasted for about 30 years from the late 1960s to 1998. Also known internationally as the Northern Ireland conflict, it began in the late 1960s and is usually deemed to have ended with the Good Friday Agreement of 1998. Although the Troubles mostly took place in Northern Ireland, at times violence spilled over into parts of the Republic of Ireland, England, and mainland Europe. Sometimes described as an Asymmetric warfare, asymmetric or Irregular warfare, irregular war or a low-intensity conflict, the Troubles were a political and nationalistic struggle fueled by historical events, with a strong Ethnic conflict, ethnic and sectarian dimension, fought over the Partition of Ireland, status of Northern Ireland. Unionism in Ireland, Unionists and Ulster loyalism, loyalists, who for Plantation of Ulster, historical reasons were mostly Ulster Protestants, wanted Northern Ireland to remain within the United Ki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nash Equilibrium
In game theory, the Nash equilibrium is the most commonly used solution concept for non-cooperative games. A Nash equilibrium is a situation where no player could gain by changing their own strategy (holding all other players' strategies fixed). The idea of Nash equilibrium dates back to the time of Cournot, who in 1838 applied it to his model of competition in an oligopoly. If each player has chosen a strategy an action plan based on what has happened so far in the game and no one can increase one's own expected payoff by changing one's strategy while the other players keep theirs unchanged, then the current set of strategy choices constitutes a Nash equilibrium. If two players Alice and Bob choose strategies A and B, (A, B) is a Nash equilibrium if Alice has no other strategy available that does better than A at maximizing her payoff in response to Bob choosing B, and Bob has no other strategy available that does better than B at maximizing his payoff in response to Alice c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Handshake (Workshop Cologne '06)
A handshake is a globally widespread, brief greeting or parting tradition in which two people grasp one of each other's hands, and in most cases, it is accompanied by a brief up-and-down movement of the grasped hands. Customs surrounding handshakes are specific to cultures. Different cultures may be more or less likely to shake hands, or there may be different customs about how or when to shake hands.Fist bump can pound out flu transmission __TOC__ History The handshake may have originated in as a demonstration of peaceful intent, since it shows that the hand holds no weapon. Another possibility is that it origi ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RAND
The RAND Corporation, doing business as RAND, is an American nonprofit global policy think tank, research institute, and public sector consulting firm. RAND engages in research and development (R&D) in several fields and industries. Since the 1950s, RAND research has helped inform United States policy decisions on a wide variety of issues, including the Cold War space race, the U.S. involvement in the Vietnam War, the U.S.–Soviet nuclear arms confrontation, the creation of the Great Society social welfare programs, and national health care. RAND originated as "Project RAND" (from the phrase "research and development") in the post-war period immediately after World War II. The U.S. Army Air Forces established Project RAND with the objective of investigating long-range planning of future weapons. Douglas Aircraft Company was granted a contract to research intercontinental warfare. Project RAND later evolved into RAND, and expanded its research into civilian fields suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nice Guys Finish First
''Nice Guys Finish First'' (BBC ''Horizon'' television series) is a 1986 documentary by Richard Dawkins which discusses selfishness and cooperation, arguing that evolution often favors co-operative behaviour, and focusing especially on the tit for tat strategy of the prisoner's dilemma game. The film is approximately 50 minutes long and was produced by Jeremy Taylor. The twelfth chapter in Dawkins' book ''The Selfish Gene'' (added in the second edition, 1989) is also named ''Nice Guys Finish First'' and explores similar material. Overview In the opening scene, Richard Dawkins responds very precisely to what he views as a misrepresentation of his first book, ''The Selfish Gene''. In particular, the response of the right wing for using it as justification for social Darwinism and laissez-faire economics (free-market capitalism). Dawkins has examined this issue throughout his career and focused much of his documentary '' The Genius of Charles Darwin'' on this very issue. The c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
First World War
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting took place mainly in European theatre of World War I, Europe and the Middle Eastern theatre of World War I, Middle East, as well as in parts of African theatre of World War I, Africa and the Asian and Pacific theatre of World War I, Asia-Pacific, and in Europe was characterised by trench warfare; the widespread use of Artillery of World War I, artillery, machine guns, and Chemical weapons in World War I, chemical weapons (gas); and the introductions of Tanks in World War I, tanks and Aviation in World War I, aircraft. World War I was one of the List of wars by death toll, deadliest conflicts in history, resulting in an estimated World War I casualties, 10 million military dead and more than 20 million wounded, plus some 10 million civilian de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Live And Let Live (World War I)
Live and let live is the non-aggressive co-operative behavior that developed spontaneously during the First World War, particularly during prolonged periods of trench warfare on the Western Front. Perhaps one of the most famous examples of this is the Christmas truce of 1914. It is a process that can be characterised as the deliberate abstaining from the use of violence during war. Sometimes it can take the form of overt truces or pacts negotiated locally by soldiers. At other times it can be a tacit behaviour—sometimes characterised as "letting sleeping dogs lie"—whereby both sides refrain from firing or using their weapons, or deliberately discharge them in a ritualistic or routine way that signals their non-lethal intent. Examples This behaviour was found at the small-unit level, sections, platoons or companies, usually observed by the "other ranks", e.g., privates and non-commissioned officers. Examples were found from the lone soldier standing sentry duty, refusing t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Non-violent
Nonviolence is the personal practice of not causing harm to others under any condition. It may come from the belief that hurting people, animals and/or the environment is unnecessary to achieve an outcome and it may refer to a general philosophy of abstention from violence. It may be based on moral, religious or spiritual principles, or the reasons for it may be strategic or pragmatic. Failure to distinguish between the two types of nonviolent approaches can lead to distortion in the concept's meaning and effectiveness, which can subsequently result in confusion among the audience. Although both principled and pragmatic nonviolent approaches preach for nonviolence, they may have distinct motives, goals, philosophies, and techniques. However, rather than debating the best practice between the two approaches, both can indicate alternative paths for those who do not want to use violence. Nonviolence has "active" or "activist" elements, in that believers generally accept the need ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guppy
The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines. (The "Y" in the acronym was added for pronounceability.) The navy began the program by testing and reverse engineering two German Type XXI U-boats— and —obtained as war reparation. That analysis led to four goals—increasing the submarines' battery capacity, streamlining the boats' structures, adding snorkels, and improving fire control systems. The navy immediately focused on designing a new class of submarine, but the Bureau of Ships believed the fleet of existing , , and submarines could be modified to incorporate the desired improvements. In June 1946, the Chief of Naval Operations approved the GUPPY project. The initial two-boat test program, implemented by the Portsmouth Naval Shipyard, eventually grew into several successive conversion programs. Those upgrades proceed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Hinde
Robert Aubrey Hinde (26 October 1923 – 23 December 2016) was a British zoologist, ethologist and psychologist.Bateson, P., Stevenson-Hinde, J., & Clutton-Brock, T. (2018). Robert Aubrey Hinde CBE. 26 October 1923—23 December 2016. 65, ''Biographical Memoirs of Fellows of the Royal Society.''Hinde, R.A. (2010-02-09, 2010-03-04, 2010-03-25). Hinde, Robert (Part 1 of 7). An Oral History of British Science. (L. Brodie, Interviewer). ''British Library Sounds''. Retrieved from https://sounds.bl.uk/Oral-history/Science/021M-C1379X0008XX-0001V0 . He served as the emeritus Royal Society research professor of zoology at the University of Cambridge. Hinde is best known for his ethological contributions to the fields of animal behaviour and developmental psychology. Early life Hinde was born in Norwich, the county town of Norfolk, England, on 26 October 1923, to Ernest and Isabella Hinde. Ernest was a medical doctor whose family was independently wealthy through the textile tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
