All articles starting with E
17,681 articles
Elemental iron
Elemental iron (CAS 7439-89-6) is metallic iron used principally to make steel, with specialized uses in food fortification and as an EU-approved low-risk molluscicide active substance since May 2025.
Elemental mapping
Elemental mapping is an analytical microscopy technique that scans an electron or X-ray beam across a sample to image where each chemical element sits, pixel by pixel.
Elementals (Marvel Comics)
The Elementals are a team of four nearly immortal extradimensional supervillains in Marvel Comics, Hellfire, Hydron, Magnum, and Zephyr, who control fire, water, earth, and air and first appeared in Supernatural Thrillers #8.
Elementary (TV series)
Elementary (CBS, 2012-2019) is an American crime drama reimagining Sherlock Holmes (Jonny Lee Miller) as a recovering-addict NYPD consultant with Dr. Joan Watson (Lucy Liu); seven seasons, 154 episodes, finale "Their Last Bow."
Elementary algebra
Elementary algebra, also known as college algebra or high school algebra, is the branch of mathematics that uses letters as variables to write and solve equations, taught in school and introductory college courses.
Elementary and Secondary Education Act
Elementary and Secondary Education Act (ESEA), 1965 US federal law (P.L. 89-10) providing the first general federal K-12 aid, whose Title I funds disadvantaged students; reauthorized by NCLB 2001 and ESSA 2015.
Elementary charge
The elementary charge, symbol e, is the magnitude of the charge carried by a single electron or proton, fixed exactly at 1.602176634 × 10⁻¹⁹ coulombs in the SI since 2019.
Elementary Data
Elementary Data (elementary-data.com) is a Tel Aviv-based data observability company founded in 2021 by Or Avidov and Maayan Salom, YC W22, offering an open-source dbt-native observability package and Elementary Cloud; acquired by Boomi in October 2026.
Elementary equivalence
Elementary equivalence, or elementarily equivalent structures, is a relation between structures of the same first-order language that satisfy exactly the same first-order sentences, formulated by Alfred Tarski in 1930.
Elementary function
An elementary function is a function built by repeated composition from constants, addition, multiplication, division, root extraction, and algebraic, exponential, logarithmic, and trigonometric functions and their inverses.
Elementary matrix
An elementary matrix, or elementary matrices collectively, is a square matrix made from the identity by one row operation: a swap, a scaling, or a row addition.
Elementary OS
elementary OS is a design-oriented, beginner-friendly Linux distribution based on Ubuntu's long-term support releases, built around the custom Pantheon desktop and the pay-what-you-can AppCenter store, first released in 2011.
Elementary particle
An elementary particle, also called a fundamental particle, is a particle not made of simpler parts. In the Standard Model these include quarks, leptons, gauge bosons, and the Higgs boson.
Elementary reaction
An elementary reaction is a chemical reaction occurring in a single step through a single transition state, and elementary steps form a complex reaction's mechanism.
Elementary symmetric polynomial
An elementary symmetric polynomial σₖ is the sum of all products of k distinct variables x₁, ..., xₙ; by the fundamental theorem, every symmetric polynomial is uniquely a polynomial in them, a fact underlying Vieta's formulas.
Elementis
Elementis plc is a British specialty chemicals company producing hectorite-based rheology modifiers for coatings, personal care, and energy, listed on the London Stock Exchange in the FTSE 250.
Elements (Jihe Yuanben)
Elements, or Jihe Yuanben (几何原本), is the first Chinese translation of Euclid's Elements, begun by Matteo Ricci and Xu Guangqi in the Wanli era and completed by Li Shanlan and Alexander Wylie.
Éléments de mathématique
Éléments de mathématique is a treatise on mathematics by Nicolas Bourbaki, a largely French collective, rebuilding modern mathematics axiomatically in ten books across roughly forty volumes.
Elements of AI
Elements of AI is a series of free online courses on artificial intelligence created by MinnaLearn, formerly Reaktor, and the University of Helsinki, with over 1.4 million students.
Elements of art
Elements of art: the visual building blocks (line, shape, form, space, color, value, texture) used in formal analysis and art education, paired with the principles of design; lists vary by institution.
Elements of Harmony
Elements of Harmony: six magical artifacts in My Little Pony: Friendship is Magic (Honesty, Loyalty, Generosity, Laughter, Kindness, Magic), worn by the Mane 6, kept at the Tree of Harmony, used against Nightmare Moon and Discord.
Elements of music
The elements of music, also known as the rudiments of music or musical parameters, are basic sound characteristics, including melody, rhythm, harmony, dynamics, timbre, texture, and form, that composers and performers manipulate to create music.
Elen Bunatyants Shakirova
Elen Bunatyants-Shakirova (Элен Бунатьянц-Шакирова), born 1970 in Mary, Turkmenistan, is a Russian center, 1992 Olympic basketball gold medalist with the Unified Team, three-time Olympian, EuroBasket medalist, and former WNBA player with Houston and Charlotte.
Elena (musician)
Elena Gheorghe, born 1985 in Bucharest, is a Romanian pop singer who represented Romania at Eurovision 2009 with "The Balkan Girls" and later scored Romanian number-one singles like "Disco Romancing".
Elena (Street Fighter)
Elena (Street Fighter): Kenyan capoeira fighter debuting in Street Fighter III: New Generation (1997), known for her Healing super art, kick-only moveset, and 2025 Street Fighter 6 DLC debut.
Elena (Эле́на) (2011 film)
Elena (Эле́на) is Andrey Zvyagintsev's 2011 Russian drama, his third feature, in which former nurse Elena (Nadezhda Markina) murders her wealthy husband Vladimir (Andrey Smirnov) to secure her son's inheritance; it won the Cannes Un Certain Regard Special Jury Prize.
Elena A. Levashina
Elena A. Levashina is a Russian-born immunologist who studies mosquito immunity to malaria and heads the Vector Biology Unit at the Max Planck Institute for Infection Biology.
Elena Anaya
Elena Anaya Gutiérrez, Spanish actress born in Palencia in 1975, star of Lucía y el sexo and La piel que habito, 2012 Goya winner, villain of Wonder Woman, and lead of Jaula, Las largas sombras, and Netflix's Innato.
Elena Aprile
Elena Aprile, born 1954, is an Italian experimental physicist at Columbia University who founded the XENON dark matter search in 2002 and leads it as spokesperson.
Elena B. Pasquale
Elena B. Pasquale is an American-based molecular biologist known for her work on Eph receptors and ephrins at Sanford Burnham Prebys in La Jolla, California.