All articles starting with L
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LY Corporation
LY Corporation, also known as LINE Yahoo, is a Japanese internet company formed in 2023 by merging LINE Corporation and Yahoo Japan Corporation under Z Holdings.
Ly dynasty
The Ly dynasty (Nhà Lý) ruled Dai Viet in northern Vietnam from 1009 to 1225, founded by Ly Cong Uan and ending with the Tran dynasty.
Ly Hue Tong
Ly Hue Tong (Lý Huệ Tông), personal name Ly Sam, was emperor of Vietnam's Ly dynasty from 1210 to 1224, abdicating to his daughter Ly Chieu Hoang.
Ly Nhan Tong
Ly Nhan Tong (Lý Nhân Tông) was emperor of Vietnam's Ly dynasty from 1072 to 1128, opening the civil examination system and defeating a Song invasion.
Ly Phat Tu
Ly Phat Tu (Lý Phật Tử), also called Hau Ly Nam De, was a king of Van Xuan in northern Vietnam who reigned from 571 to 602.
Ly Thai To
Ly Thai To (Lý Thái Tổ), personal name Ly Cong Uan, was the founding emperor of the Ly dynasty of Dai Viet, reigning from 1009 to 1028.
Lý Thái Tổ's campaign against Champa
The 1044 invasion of Champa, attributed by Vietnamese sources to Emperor Lý Thái Tông rather than Lý Thái Tổ, was the first large-scale Lý-dynasty attack on Champa.
Ly Thai Tong
Ly Thai Tong (Lý Thái Tông), born Ly Phat Ma, was the second emperor of the Ly dynasty of Dai Viet, reigning from 1028 to 1054 and issuing Vietnam's first written law code in 1042.
Lý Thánh Tông
Lý Thánh Tông (李聖宗), personal name Lý Nhật Tôn, was the third emperor of Vietnam's Lý dynasty, reigning from 1054 to 1072 and renaming the state Đại Việt.
Ly Thuong Kiet
Ly Thuong Kiet (Lý Thường Kiệt, 1019–1105) was a Vietnamese general and statesman of the Ly dynasty who served three kings and led the war against the Song dynasty.
LY-1 (燎原-1)
LY-1 (燎原-1), formally Liaoyuan-1, is a Chinese shipborne high-energy laser weapon for terminal naval air defense, first shown at the 3 September 2025 Beijing military parade.
Lý–Champa War (1069)
The Lý–Champa War of 1069 was a war in which Đại Việt's Emperor Lý Thánh Tông invaded Champa, captured King Rudravarman III, and gained three ceded provinces.
Ly–Song war
The Ly–Song war (Chien tranh Tong–Dai Viet, 1075–1077) was fought between the Ly dynasty of Dai Viet and China's Song dynasty, ending with a Song withdrawal.
Ly49-like, N-terminal
Ly49-like, N-terminal (InterPro IPR013600, Pfam PF08391) is the N-terminal C-type lectin-like domain region of Ly49 mouse NK cell receptors, homodimeric type II transmembrane MHC-I-binding proteins with variable strain gene numbers.
Lyal Watson
Lyal Watson (1927–2015) was an Australian-born physician and endocrinologist who spent his career at University College Hospital, London, devising the hydrocortisone suppression test for diagnosing hypercalcaemia.
Lyane Hegemann
Lyane Hegemann is a German pop singer, songwriter, and producer who fronted the 1990s Eurodance act E-Rotic and now records pop-Schlager on her own label, 3H Records.
Lyantorskoye Oil and Gas Field
The Lyantorskoye field (Лянторское месторождение) is a large oil, gas, and condensate field near Lyantor in Khanty-Mansi Okrug, western Siberia, discovered in 1965 and operated by Surgutneftegas since 1978.
Lyapunov equation
The Lyapunov equation is a matrix equation, AᵀP + PA = −Q, named for Aleksandr Lyapunov, whose positive definite solution certifies the stability of a linear dynamical system.
Lyapunov exponent
A Lyapunov exponent measures the average exponential rate at which nearby trajectories of a dynamical system separate or converge, arising from Aleksandr Lyapunov's 1892 thesis on stability of motion.
Lyapunov exponent (ODE stability)
A Lyapunov exponent measures the average exponential rate at which nearby trajectories of a dynamical system diverge or converge; a positive maximal exponent signals chaos, while negative exponents indicate contraction toward an attractor.
Lyapunov function
A Lyapunov function is a scalar function, positive away from an equilibrium and nonincreasing along trajectories, whose existence proves stability without solving the differential equations.
Lyapunov method
The Lyapunov method certifies stability of a dynamical system's equilibrium through an energy-like function that decreases along trajectories, deciding stability from the equation itself without solving it.
Lyapunov optimization
Lyapunov optimization is an online control framework for stochastic networks that stabilizes queues while optimizing time-average objectives, making greedy per-slot decisions from current queue states alone.
Lyapunov stability
Lyapunov stability is a mathematical notion of stability for an equilibrium point of a dynamical system: solutions starting sufficiently close remain close, introduced by Aleksandr Lyapunov in 1892.
Lyapunov–Schmidt reduction
Lyapunov–Schmidt reduction is a bifurcation-theory technique that replaces a large or infinite-dimensional equation near a singular point by a smaller finite-dimensional equation carrying all essential information about the bifurcation.
Lycaenidae
Lycaenidae, the gossamer-winged butterflies (blues, coppers, hairstreaks, azures), a family of about 4,700 small butterfly species, over half of which maintain ant associations ranging from mutualism to nest parasitism.
Lycalopex culpaeus
Lycalopex culpaeus, the culpeo or Andean fox, is a large South American canid from southern Colombia to Tierra del Fuego; IUCN Least Concern, diet dominated by small mammals and lagomorphs.
Lycalopex gymnocercus
The Pampas fox, also called Azara's fox (Lycalopex gymnocercus), is an omnivorous canid living in open habitats of southern South America, from Bolivia and Paraguay to Argentina.
Lycaonia
Lycaonia (Lykaonia) was an inland region of the southern central Anatolian plateau around Iconium and Laranda, famous for its sheep, later a Roman province around 371 CE.
Lycée Condorcet alumni
The Lycée Condorcet is a Paris lycée on the rue du Havre, founded under Napoléon I as the Lycée Bonaparte, whose alumni include Proust, Bergson, Louis Renault, and three presidents.