All articles A–Z
519,064 articles
Einstein–Infeld–Hoffmann equations
The Einstein–Infeld–Hoffmann equations, or EIH equations, give the motion of gravitating bodies in general relativity to first post-Newtonian order, derived by Einstein, Infeld, and Hoffmann in 1938 and used in solar-system ephemerides.
Einstein–Oppenheimer relationship
The Einstein–Oppenheimer relationship was the association between Albert Einstein and J. Robert Oppenheimer, who overlapped at Princeton's Institute for Advanced Study, where Oppenheimer directed and Einstein was its most famous faculty member.
Einstein–Podolsky–Rosen paradox
The Einstein–Podolsky–Rosen (EPR) paradox is a 1935 argument by Einstein, Podolsky, and Rosen claiming quantum mechanics is incomplete; Bell tests from 1972 onward sided with quantum mechanics.
Einstein–Rosen cylindrical waves
Einstein–Rosen cylindrical waves are exact vacuum solutions of Einstein's field equations describing gravitational waves with cylindrical symmetry, introduced by Einstein and Rosen in their 1937 paper "On Gravitational Waves".
Einstein's static universe
Einstein's static universe is a cosmological solution of general relativity, presented by Albert Einstein in 1917, in which a finite, positively curved 3-sphere universe is balanced by a cosmological constant.
Einstein's thought experiments
Einstein's thought experiments (German: Gedankenexperimente) are imaginary scenarios Albert Einstein used to derive relativity, including the chasing of a light beam, the light clock, the train and embankment, and the elevator.
Einstein@Home
Einstein@Home is a distributed volunteer computing project launched in 2005 by the Max Planck Institute for Gravitational Physics, which uses idle PCs to find pulsars.
Einsteinium
Einsteinium (Element 99), symbol Es, is a synthetic radioactive actinide discovered in 1952 in the Ivy Mike thermonuclear test debris; it has no uses outside basic research.
Einstürzende Neubauten
Einstürzende Neubauten, German experimental/industrial band founded 1 April 1980 in West Berlin by Blixa Bargeld and N.U. Unruh; known for instruments made of metal and power tools, debut Kollaps (1981), pioneering crowdfunding, and 2024 album Rampen (apm: alien pop music).
Einthoven (lunar crater)
Einthoven is a 73.94 km (NASA: 69 km) IAU-named 1970 impact crater on the lunar far side at 5.06° S, 110.06° E, named for Dutch physiologist Willem Einthoven; nearby lies the young 1,143 m Einthoven cold spot crater.
Einthoven's triangle
Einthoven's triangle: imaginary equilateral triangle of bipolar limb leads I, II, III (RA, LA, LL corners), described by Willem Einthoven in 1912 for frontal-plane cardiac axis calculation; basis of Einthoven's law.
Eintracht Braunschweig
Eintracht Braunschweig (BTSV Eintracht von 1895 e.V., Die Löwen), German football club founded 1895, Bundesliga founding member 1963, champions 1966/67, first German club with jersey advertising (Jägermeister 1973), now in 2. Bundesliga.
Eintracht Frankfurt
Eintracht Frankfurt, German Bundesliga football club founded 1899 (Frankfurter FC Victoria); 1959 champions, 1980 UEFA Cup and unbeaten 2022 Europa League winners; member-owned 67.89% under 50+1, over 155,000 members, €389.1m revenue 2024/25, plays at Deutsche Bank Park.
Eion
Eion (Ἠϊών) was an ancient Greek port at the mouth of the Strymon river in Thrace, on Profitis Ilias hill; founded in the 7th century BC, taken by Cimon in 477/6 BC, and later the port of Amphipolis.
Eion Bailey
Eion Bailey (Eion Francis Hamilton Bailey, born 1976) is an American actor from Santa Ynez Valley, California, known for Fight Club, Almost Famous, Band of Brothers, Once Upon a Time, and as Jim Matthews in From.
EIP Deep Decarbonization Frontier Fund I
EIP Deep Decarbonization Frontier Fund I is a New York-based climate tech venture fund managed by Energy Impact Partners that closed at $485 million in 2022.
Eip Flagship
EIP Flagship is the fund family for Flagship Fund III, Energy Impact Partners' third flagship private equity fund, which closed at $1.36 billion in October 2025.
Eipper Quicksilver
The Eipper Quicksilver is a family of American ultralight aircraft that began as a rigid-wing hang glider in the early 1970s at Dick Eipper's Eipper-Formance.
Eir Macula
Eir Macula is a 145-km-wide dark spot (macula) on Titan at 24°S, 114.7°W, named for the Norse goddess of healing and peace and adopted by the IAU in 2006; one of seven named Titan maculae.
EIRA trial
EIRA trial (NCT03136211): Spanish cluster-randomised hybrid type 2 trial in 25 primary care centres, 3062 adults 45-75, testing a Transtheoretical Model multiple health behaviour change intervention for smoking, diet, and physical activity versus usual care.
Eiraku Tsūhō
Eiraku Tsūhō (永楽通宝, Chinese: Yongle Tongbao) was a Ming dynasty copper one-mon coin, cast in China from 1408 and imported into Japan in large quantities as its standard currency until 1609.
Éire
Éire is the Irish-language name for Ireland and, under Article 4 of the 1937 Constitution, the constitutional name of the Irish state, alongside "Ireland" in English. From Old Irish Ériu; formerly official as Eire, 1937–49.
Eirene (moon)
Eirene, officially Jupiter LVII and once designated S/2003 J 5, is a small retrograde irregular moon of Jupiter in the Carme group, discovered by Scott S. Sheppard in 2003.
EirGrid
EirGrid is Ireland's state-owned electricity transmission system operator, running the national grid and interconnectors to Great Britain, and jointly operating the Single Electricity Market with SONI.
Eirik Kvalfoss
Eirik Kvalfoss, born 1959 in Voss, Norway, is a former biathlete, 1984 Olympic 10 km sprint champion at Sarajevo and three-time world champion (1982, 1983, 1989), also overall World Cup winner.
Eiríks saga rauða
Eiríks saga rauða, or the Saga of Erik the Red, is a 13th-century Icelandic family saga telling of Erik the Red's settlement of Greenland and Norse voyages to Vinland.
Eiroku Incident
The Eiroku Incident, also called the Eiroku Coup (永禄の変), was the killing of shogun Ashikaga Yoshiteru by Miyoshi-led forces at Nijō Palace in Kyoto in 1565.
Eisai
Eisai is a Japanese research-based pharmaceutical company headquartered in Tokyo, founded in 1936, known for Aricept, Lenvima, and Leqembi, an Alzheimer's drug developed with Biogen.
Eisaku Satō
Eisaku Satō (佐藤榮作) was a Japanese politician who served as Prime Minister from 1964 to 1972, the longest tenure at the time, and won the 1974 Nobel Peace Prize.
Eisaya Hosuwan (อิษยา ฮอสุวรรณ)
Eisaya Hosuwan (อิษยา ฮอสุวรรณ), nicknamed Oom (อุ้ม), is a Thai Channel 3 actress born 1996 in Udon Thani, known for Grace in Bad Genius (2017) and Jaiphisut in Dhevaprom: Jaiphisut (2024), with films totaling over 2,400 million baht.