All articles starting with K
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Kruskal–Wallis test
The Kruskal–Wallis test is a nonparametric statistical test that decides whether three or more independent groups come from the same distribution by comparing pooled rank sums, introduced in 1952.
Kruskal's algorithm
Kruskal's algorithm is a greedy algorithm that finds a minimum spanning tree of any connected, weighted, undirected graph, published by Joseph B. Kruskal in 1956.
Kruskal's tree theorem
Kruskal's tree theorem is a 1960 result in well-quasi-order theory, proved by J. B. Kruskal, stating that finite trees over a well-quasi-ordered label set are well-quasi-ordered under homeomorphic embedding.
Krustpils
Krustpils (Kreutzburg), Latvian town on the right bank of the Daugava, first recorded 1237 with its castle; von Korff manor from 1585, railway hub from 1861, merged with Jēkabpils in 1962.
Krusty Krab
Krusty Krab, the fictional Bikini Bottom fast-food restaurant in SpongeBob SquarePants founded by Mr. Krabs, home of the secret-formula Krabby Patty, rival of the Chum Bucket, and subject of a real Fifth Circuit trademark case.
Krusty the Clown
Krusty the Clown (Herschel Shmoikel Yerucham Pinchas Krustofsky) is The Simpsons' cynical Jewish children's TV entertainer, voiced by Dan Castellaneta, inspired by Portland clown Rusty Nails, originally conceived as Homer in disguise.
Kruti Mahesh
Kruti Mahesh is an Indian film choreographer who won the National Film Award for Best Choreography for 'Ghoomar' from Padmaavat (2018), and later choreographed 'Dholida' in Gangubai Kathiawadi (2022).
Krutrim (कृत्रिम)
Krutrim (कृत्रिम), meaning "artificial" in Sanskrit, is an Indian AI company founded in 2023 by Bhavish Aggarwal of Ola. It became India's first generative-AI unicorn in 2024 and now provides AI cloud services.
Kruzenshtern (ship)
Kruzenshtern (Крузенштерн) is a Russian four-masted barque and sail training ship, built in Germany in 1926 as Padua and transferred to the Soviet Union in 1946.
Kruzof Island
Kruzof Island, also historically Ostrov Tlikh, San Jacinto, and Crooze Island, is a 23-mile-long island in Alaska's Alexander Archipelago about 13 miles west of Sitka, dominated by the dormant 3,200-foot volcano Mount Edgecumbe and mostly Tongass National Forest land.
Krvavé sonety
Krvavé sonety (The Bloody Sonnets) is a cycle of 32 anti-war sonnets by the Slovak poet Pavol Országh Hviezdoslav, written after the outbreak of the First World War in 1914.
Kry
Kry, formerly Livi outside the Nordics, is a Stockholm digital health company founded in 2014 that combines app-based video consultations with its own physical clinics across four European countries.
Krylov complexity
Krylov complexity, also called K-complexity, is a parameter-free measure in quantum many-body physics of how far a time-evolving operator spreads along the Krylov basis generated by the Lanczos algorithm, used as a diagnostic of quantum chaos.
Krylov State Research Centre
Krylov State Research Centre, also known as KSRC, was a Russian state shipbuilding research institute in Saint Petersburg, established in 1894 as the first ship model testing institution in Russia.
Krylov subspace
A Krylov subspace is the vector space spanned by b, Ab, A²b, and so on for a matrix A, named for Aleksey Krylov in 1931.
Krylov subspace methods
Krylov subspace methods are iterative projection methods for large linear systems, eigenvalue problems, and matrix functions, building approximations from repeated matrix-vector products; examples include CG, GMRES, and BiCGSTAB.
Krylya (Wings) Festival
Krylya (Крылья, "Wings") is a Russian open-air rock festival held annually in Moscow from 2000 to 2007, mostly at the Tushino airfield, and revived once in 2013.
Krynychky Raion
Krynychky Raion was a raion (district) of Dnipropetrovsk Oblast, Ukraine, with its administrative center in Krynychky, abolished in 2020 when its area merged into Kamianske Raion.
Kryo
Kryo, also known as Qualcomm Kryo, is the CPU brand inside Qualcomm's Snapdragon chips, introduced in 2015 with the Snapdragon 820, later built on Arm Cortex cores.
Krypto
Krypto the Superdog is DC Comics' super-powered canine companion of Superman and the Superman Family, created by Otto Binder and Curt Swan, first appearing in Adventure Comics #210 (1955), with Kryptonian powers and a DCU film role based on James Gunn's dog Ouzo.
Krypto Saves the Day!
Krypto Saves the Day! is a Warner Bros. Animation and DC Studios series of dialogue-free animated shorts starring Superman's dog Krypto, announced February 2025, with four five-to-six-minute season 1 shorts on HBO Max and YouTube from August 2025 and season 2 from September 2026.
Krypto the Superdog
Krypto the Superdog: 2005–2006 Warner Bros. Animation series on Cartoon Network about Superman's Kryptonian dog, created by Chris Mitchell with Alan Burnett and Paul Dini, 39 episodes in two seasons, distinct from the comic character and the Super-Pets film.
Krypton
Krypton (symbol Kr, atomic number 36) is a colorless, odorless noble gas in Earth's atmosphere, used in fluorescent lamps, the krypton fluoride laser, and defining the meter from 1960 to 1983.
Krypton (comics)
Krypton is Superman's fictional home planet in DC Comics, introduced in Action Comics #1 (1938), orbiting the red dwarf Rao about 50 light years away, destroyed in every continuity and retold across miniseries, Elseworlds, and film adaptations.
Krypton (TV series)
Krypton (2018–2019) is a Syfy DC superhero science-fiction drama developed by David S. Goyer, following Superman's grandfather Seg-El (Cameron Cuffe) two generations before Krypton's destruction; canceled after two seasons amid a 50% ratings decline.
Krypton difluoride
Krypton difluoride (KrF₂) is a colorless crystalline compound of krypton and fluorine, first prepared in 1963, thermodynamically unstable, and among the strongest oxidative fluorinating agents known, able to oxidize gold and xenon below room temperature.
Krypton fluoride laser
A krypton fluoride (KrF) laser is an excimer laser emitting 248 nm deep ultraviolet light from krypton and fluorine gas; it was the first DUV lithography light source.
Krypton-85
Krypton-85 is a radioactive krypton isotope with a half-life of about 10.7 years, produced by nuclear fission, released during spent-fuel reprocessing, and used as an atmospheric tracer.
Kryptonian
Kryptonians are the fictional humanoid alien species from DC Comics' planet Krypton, home of Superman (Kal-El), Supergirl, Zod, and Krypto. Powerless under Krypton's red sun, they gain superpowers under a yellow sun and are weakened by Kryptonite.
Kryptonite
Kryptonite, the fictional radioactive remains of planet Krypton and Superman's weakness, debuted on 1940s radio before comics (Superman #61, 1949), gained green color in 1951, and spawned many colored variants.