All articles starting with D
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Derandomization
Derandomization converts a randomized algorithm into an equivalent deterministic one without substantially increasing its complexity; whether BPP equals P is a central open question in complexity theory.
Derangement
A derangement is a permutation of a set that leaves no element in its original position; Montmort posed counting them in 1708, and about 1/e of permutations are derangements.
Derartu Tulu
Derartu Tulu (ዻራርቱ•ቱሉ, born 1972, Bekoji) is an Ethiopian distance runner, two-time Olympic 10,000 m champion (1992, 2000), first black African woman Olympic gold medallist, 2001 world champion, and later Ethiopian Athletics Federation president.
DeRay Mckesson
DeRay Mckesson (born 1985, Baltimore) is a civil rights activist, former school administrator, and co-founder of Campaign Zero who rose to prominence during the 2014 Ferguson protests, hosted Pod Save The People, and ran sixth in Baltimore's 2016 mayoral primary.
Derazhnya Raion
Derazhnya Raion (Деражнянський район) was a district of Khmelnytskyi Oblast, Ukraine, formed 1923, centered on Derazhnya, abolished July 2020 and merged into Khmelnytskyi Raion; area 0.9 thousand km², 38,149 people (2001).
Derbent (Дербент)
Derbent (Дербент; Darband, دربند) is an ancient fortress city on the western Caspian coast in Dagestan, Russia, founded by Sasanian Persia in 438 CE, famed for its Naryn-Kala citadel, parallel defensive walls, and 2003 UNESCO World Heritage inscription.
Derbent Khanate
The Derbent Khanate was a semi-independent khanate centered on the Caspian fortress-city of Derbent in southern Dagestan, established after 1747 and annexed by Russia in 1806, during the Russo-Persian War of 1804-1813.
Derbidae
Derbidae, derbid planthoppers (Spinola, 1839), a family of Fulgoroidea planthoppers with 166 genera and 1,722 species; diagnosed by a short apical rostrum segment, classified in three subfamilies, and studied as possible palm phytoplasma vectors.
Derby
Derby: city and unitary authority on the River Derwent in the East Midlands, England; county town of Derbyshire. Population 274,100 (2024); home of the 1721 Silk Mill and the Derwent Valley Mills World Heritage Site.
Derby County F.C.
Derby County F.C. (the Rams), English football club founded 1884 in Derby; Football League founder member 1888; First Division champions 1971-72 under Clough and 1974-75 under Mackay; FA Cup 1946; now a Championship club owned by Clowes Developments.
Derby della Madonnina
Derby della Madonnina, the Milan derby between AC Milan and Inter, shared tenants of San Siro since 1926; named for the Duomo's Madonnina statue, first played 1908, Inter lead a near-even head-to-head.
Derby Italiano
The Derby Italiano is Italy's premier flat horse race, run over 2,200 meters on turf. Historically held at Capannelle in Rome, it is known as the Blue Riband.
Derby Litchurch Lane Works
Derby Litchurch Lane Works, formerly the Derby Carriage and Wagon Works, is a railway rolling stock factory in Derby, England. Owned by Alstom and opened in 1876, it is the UK's only end-to-end train factory.
Derby Owners Club (ダービーオーナーズクラブ)
Derby Owners Club (ダービーオーナーズクラブ) is a 1999 Sega NAOMI arcade horse breeding and racing simulation by Hitmaker, using magnetic horse cards, with versions including 2000 and World Edition.
Derby School
Derby School was a Derby grammar school endowed by Queen Mary's 1554 charter, based at St Peter's churchyard then St Helen's House from 1861, closed 1989; successor Derby Grammar School opened 1995 in Littleover.
Derbyshire
Derbyshire, an English county in the centre of England with about 827,000 people (2025), largest town Chesterfield. Its ten councils were to be replaced by two unitary councils from 1 April 2028, a decision paused in September 2026.
Dercennus (crater on Dione)
Dercennus is an 86.20-km-wide impact crater on Dione, Saturn's icy moon, centered at 29.75°N, 279.93°W. Named by the IAU on March 17, 2008 after an ancient king of the Laurentians from Virgil's Aeneid tradition.
Derceto Corona
Derceto Corona is a 200-km-wide corona on Venus at 46.8°S, 20.2°E, formerly Ammavaru Caldera, central edifice of the Derceto large igneous province with 37 flow units and caldera sag-collapse.
Derck de Vilder
Derck de Vilder, Dutch field hockey player (born 1998, Amsterdam), Netherlands men's team number 34; 113 senior caps, 9 goals; Olympic gold at Paris 2024, beating Germany in the final on shootout.
Derda
Derda is a two-player Polish jass card game, related to Clobyosh, once popular among currency traders and gamblers in communist-era Poland and played for money. It uses a 32-card deck, sequence bonuses, and a 500-point target.
Dere Street
Dere Street is the modern name of the Roman road built AD 79–81 under Agricola, running from York (Eboracum) via Corbridge to Cramond on the Firth of Forth; name derives from the Anglo-Saxon kingdom of Deira, not a Roman name.
Derealization
Derealization is the feeling that one's surroundings are unreal, dreamlike, or detached, with intact reality testing; classified with depersonalization as depersonalization/derealization disorder (DPDR), a dissociative disorder affecting about 1 to 2% of people, usually beginning in adolescence, and treated mainly with psychotherapy.
Derecho
A derecho is a widespread, long-lived windstorm produced by a band of rapidly moving thunderstorms, causing straight-line wind damage along paths hundreds of miles long.
Dereck Lively II
Dereck Lively II (born 2004, Philadelphia) is an NBA center for the Dallas Mavericks; Duke one-and-done, drafted 12th overall in 2023 by Oklahoma City, 2023-24 All-Rookie, 2024 NBA Finals starter-level rim protector, later limited by foot and ankle injuries.
Dereck Moncada
Dereck Alessandro Moncada Arguijo (born 2007) is a Honduran right winger for Swiss club Lugano and Honduras; son of Maynor Figueroa, €3m July 2026 signing, joint fourth in 2026/27 Super League scoring.
Derecognition
Derecognition is the removal of an asset or liability from the balance sheet when it no longer meets the definition of an asset or liability, central to securitisation accounting.
Deregulation
Deregulation is the reduction, elimination, or simplification of government regulations on an industry or activity, including reduced enforcement and sunset provisions that let rules lapse automatically.
Derek (TV series)
Derek is a British mockumentary-style comedy-drama (2012–2014) created by and starring Ricky Gervais as care home worker Derek Noakes, with Karl Pilkington, Kerry Godliman, and David Earl, on Channel 4 and Netflix.
Derek A. Pratt
Derek A. Pratt is a Canadian organic and chemical biology chemist, a professor at the University of Ottawa since 2010, known for research on lipid autoxidation and ferroptosis inhibitors.
Derek A. T. Cummings
Derek A. T. Cummings, also published as Derek Cummings, is an infectious-disease epidemiologist known for modeling dengue and influenza, and a Bloomberg Distinguished Professor at Johns Hopkins.