42,772 articles
Leslie Greengard
Leslie Greengard is an applied mathematician and computer scientist, Silver Professor at NYU's Courant Institute and director at the Flatiron Institute, known for the fast multipole method.
Leslie Leiserowitz
Leslie Leiserowitz, born 1934 in Johannesburg, is an Israeli chemist and crystallographer at the Weizmann Institute whose work showed how molecular chirality controls crystal shape and nucleation.
Leslie M. Schoop
Leslie M. Schoop is a solid state chemist and Professor of Chemistry at Princeton University, known for the topological semimetal ZrSiS and the square-net design principle for topological materials.
Leslie speaker
The Leslie speaker, also called the Leslie cabinet, is a rotating loudspeaker invented by Donald Leslie in the late 1930s to add vibrato and tremolo to the Hammond organ.
Less-than sign
The less-than sign, or less-than symbol, is the mathematical symbol <, indicating that the value on its left is smaller than the value on its right.
Lesser-used silyl protecting groups
Lesser-used silyl protecting groups are silyl groups documented as alternatives to widely used silyl ethers for alcohols and phenols, including DEIPS, DPMS, sisyl, and TBDPSE.
Lessivage
Lessivage, also called argilluviation, is the transfer of fine clay particles, chiefly under 2 μm, from a soil's eluviated E-horizon to a deeper B-horizon, producing the clay-enriched horizons of Luvisols.
Lester Andrews
Lester Andrews, born 1942, is an American physical chemist and emeritus professor at the University of Virginia known for matrix-isolation infrared spectroscopy and the first compounds bonding uranium to noble gases.
Lester Germer
Lester Halbert Germer (1896–1971) was an American physicist at Bell Labs who, with Clinton Davisson, first demonstrated the wave properties of the electron in 1927, confirming de Broglie's hypothesis.
Lester R. Ford
Lester R. Ford, born Lester Randolph Ford, was an American mathematician known for Ford circles and for Automorphic Functions (1929), the first English treatise on automorphic functions.
Letian Dou
Letian Dou is a materials chemist and chemical engineer known for hybrid organic-inorganic perovskites (OSiPs), Paul & Phyllis Fireman Professor of Chemistry at Emory University since 2025 after Purdue.
Leticia Cugliandolo
Leticia Cugliandolo, born 1965 in Argentina, is an Argentine statistical physicist at Sorbonne Université in Paris, known for aging and effective temperature in glassy systems.
Leticia González (theoretical chemist)
Leticia González, born 1971 in Madrid, is a Spanish theoretical chemist and professor at the University of Vienna, best known for developing the SHARC surface-hopping method for photochemistry.
Leu-Enkephalin
Leu-enkephalin, also known as [Leu⁵]enkephalin or leucine-enkephalin, is an endogenous opioid pentapeptide with the sequence Tyr-Gly-Gly-Phe-Leu that acts mainly at delta-opioid receptors and was discovered in pig brain in 1975.
Leucine
Leucine (symbol Leu or L) is an essential hydrophobic amino acid and one of three branched-chain amino acids, notable for activating mTORC1 and for its role in muscle protein synthesis.
Lev Bregman
Lev Meerovich Bregman (Лев Меерович Брегман) was a Soviet and Israeli mathematician who introduced the Bregman divergence, now standard in machine learning, and proved Bregman's theorem on matrix permanents.
Lev Gor'kov
Lev Petrovich Gor'kov (Лев Горьков; 1929–2016) was a Soviet-born Russian and American theoretical physicist of the Landau school, best known for the Gor'kov equations, which put superconductivity theory on a microscopic footing.
Lev Landau (Лев Давидович Ландау)
Lev Davidovich Landau was a Soviet theoretical physicist who won the 1962 Nobel Prize in Physics for his theories of condensed matter, especially liquid helium.
Lev Okun
Lev Borisovich Okun (Лев Борисович Окунь) was a Russian theoretical particle physicist at ITEP in Moscow who coined the term "hadron" in 1962 and campaigned against relativistic mass.
Lev P. Pitaevskii
Lev P. Pitaevskii, also known as Lev Petrovich Pitaevskii, was a Soviet and Italian theoretical physicist, co-namesake of the Gross–Pitaevskii equation governing ultracold Bose gases.
Lev Petrovich Gorkov
Lev Petrovich Gorkov (Лев Петрович Горьков; 1929–2016) was a Soviet and American theoretical physicist who in 1959 derived the Ginzburg–Landau equations of superconductivity from BCS theory, founding the GLAG framework.
Lev Pontryagin
Lev Pontryagin, also known as Lev Semenovich Pontryagin, was a Soviet mathematician who, though blind from age fourteen, created the Pontryagin characteristic classes and the maximum principle.
Lev Schnirelmann
Lev Schnirelmann, also known as Lev Genrikhovich Schnirelmann (Лев Генрихович Шнирельман), was a Soviet mathematician who created Schnirelmann density and made the first unconditional progress on Goldbach's problem.
Lev Shubnikov
Lev Shubnikov (Лев Шубников) was a Soviet low-temperature physicist who worked in Leiden from 1926 to 1930, founded the first Soviet cryogenic laboratory in Kharkiv, and died in the purges in 1937.
Level of analysis
Level of analysis is the scale or unit at which a phenomenon is examined, central to international relations explanations of war and to social science research design.
Level of free convection
The level of free convection (LFC) is the altitude at which a lifted parcel of air first becomes warmer than its environment and can rise on its own buoyancy.
Level of measurement
Level of measurement, also called scale of measurement, classifies variables into nominal, ordinal, interval, and ratio levels, a framework introduced by S. S. Stevens in 1946.
Level set
A level set of a function f is the set of all points where f equals a single constant value, such as a level curve or level surface.
Level set method
The level set method is a numerical technique that tracks moving curves and surfaces as the zero level set of a higher-dimensional function, introduced by Osher and Sethian in 1988.
Level-1 trigger
The Level-1 trigger (L1) is the first, hardware-based stage of event selection in particle physics experiments, using custom electronics to pick collision events within microseconds at the LHC.