All articles starting with L

Laplace's equation

Laplace's equation, also known as Laplace's differential equation, is the second-order partial differential equation Δu = 0, the prototype of elliptic equations; its solutions are harmonic functions describing gravitational and electrostatic potentials.

Laplace's method

Laplace's method is a technique of asymptotic analysis for estimating Laplace integrals with a large parameter, using only the region near the exponent's maximum; it dates to Laplace's 1774 memoir.

Laplacian matrix

The Laplacian matrix, also called the graph Laplacian or Kirchhoff matrix, is a graph matrix L = D − A whose eigenvalues reveal connectivity, spanning trees, and clustering.

Laplacian of Gaussian

The Laplacian of Gaussian (LoG) is an image-processing operator that detects edges as zero crossings and blobs by scale-space extrema, key to Marr–Hildreth edge detection and SIFT.

Oct 3, 2026

Laplae the Hidden Town (เมืองลับแล)

Laplae the Hidden Town (เมืองลับแล) is a 2024 Workpoint 23 Thai period fantasy drama, 20 episodes from 31 August 2024, adapted from the Uttaradit legend of a women-only hidden town where 18-year-olds hunt men to bear daughters and turmeric turns to gold.

Oct 20, 2026

Lapland (Finland)

Lapland (Lappi, Lapin maakunta) is Finland's northernmost and largest first-order administrative region: 100,366 km², 21 municipalities, capital Rovaniemi, borders Norway, Sweden, and Russia, distinct from the wider Sámi cultural region Sápmi.

Lapland (landform)

Lapland (landform): northern Fennoscandian upland and tundra region on the Fennoscandian Shield, also called Sápmi; includes Finnish Lapland (100,366 km2) and the Swedish Laponian Area, shaped by glaciation and palsa permafrost.

Lapland War

Lapland War (Lapin sota), 15 September 1944 – 27 April 1945: Finland expelled over 200,000 German troops from northern Finland under the Moscow Armistice, with scorched-earth destruction, mass evacuation, and about 774 Finnish and 1,000 German dead.

Laplandskiy Biosphere Reserve

Laplandskiy Biosphere Reserve is a strictly protected nature reserve and UNESCO biosphere reserve in the central Kola Peninsula, Russia, established in 1930 to protect northern taiga, mountain tundra, and the wild reindeer of the peninsula.

Sep 21, 2026

Lapo Bogani

Lapo Bogani is an Italian experimental physicist and chemist working on molecular magnetism, molecular spintronics, and graphene nanoribbon quantum devices, chair at the University of Florence since 2023.

Lapo Elkann

Lapo Elkann is an Italian entrepreneur and heir of the Agnelli family, grandson of Gianni Agnelli, who founded the eyewear brand Italia Independent and the customization company Garage Italia.

Laponian Area (protected area)

Laponian Area, a 940,900 ha mixed World Heritage site in Norrbotten, northern Sweden, inscribed 1996; four national parks and two nature reserves preserving Saami reindeer transhumance, Sarek mountains, and the Sjaunja mires.

Lapp Group

Lapp Group, operating as LAPP, is a German family-owned manufacturer of flexible cables, industrial connectors, and cable accessories, headquartered in Stuttgart and founded in 1959, known for the ÖLFLEX cable brand.

Sep 29, 2026

Lapping

Lapping is a precision finishing process in which loose abrasive grains in a paste or fluid remove material as a workpiece is rubbed against a shaped tool.

Laprugne

Laprugne, commune in Allier (INSEE 03139), Auvergne-Rhône-Alpes, France, in the Montagne bourbonnaise near Vichy; site of the Charrier copper-tin mine (1872-1953) where roquesite was discovered, and uranium-era housing.

Lapsang souchong (正山小种)

Lapsang souchong (正山小种, Zhèngshān Xiǎozhǒng) is a pine-smoked black tea from Tongmu, Wuyishan, Fujian, regarded as the world's earliest black tea; exported to Europe from 1610, protected by GB/T 13738.3-2012 and an EU PGI.

Lapse and shift

The lapse function and shift vector are gauge quantities in the 3+1 decomposition of general relativity that control how spacetime is sliced and how coordinates move between slices.

Lapse rate

The lapse rate, also called the atmospheric lapse rate, is the rate at which temperature falls with height in the atmosphere; its size measures atmospheric stability.

lapse rate feedback

The lapse rate feedback is a climate feedback in which warming changes the vertical temperature profile, altering radiation to space; it is negative in the tropics.

Lapsed Catholic

A lapsed Catholic, also called a fallen away or nominal Catholic, is a baptized Catholic who no longer practices the faith without formally leaving the Church.

LapSim

LapSim is a high-fidelity virtual reality laparoscopic simulator developed by Surgical Science of Gothenburg, Sweden, and launched in 2001; its performance metrics correlate with improved operating room performance.

Laptev Sea

The Laptev Sea is a marginal sea of the Arctic Ocean off Siberia, between the Taymyr Peninsula and the New Siberian Islands, renamed in 1935 for the Laptev brothers.

Laptop

A laptop, also called a laptop computer or notebook PC, is a portable personal computer with a hinged design combining display, keyboard, and pointing device, running on an internal battery.

Oct 20, 2026

Lapu-Lapu City

Lapu-Lapu City (formerly Opon) is a first-class highly urbanized city on Mactan Island, Cebu, Philippines, created 1961 under RA 3134; 497,813 people (2024), industry-led PhP 165.61 billion economy, home of Mactan Cebu International Airport.

Lapulapu

Lapulapu, also recorded as Çilapulapu, was a sixteenth-century chieftain of Mactan in the Philippines, celebrated as the first resister of Spanish colonization for the battle that killed Ferdinand Magellan in 1521.

Laputa

Laputa is the fictional flying island in Part III of Jonathan Swift's Gulliver's Travels (1726), ruled by impractical mathematicians whose loadstone-driven flight satirizes the Royal Society and Newtonian science, and names Miyazaki's Castle in the Sky.