Epsilon

This article is about Greek epsilon. For Latin epsilon, see ɛ.

Look up Ε or ε in Wiktionary, the free dictionary.

Greek alphabet

Αα	Alpha	Νν	Nu
Ββ	Beta	Ξξ	Xi
Γγ	Gamma	Οο	Omicron
Δδ	Delta	Ππ	Pi
Εε	Epsilon	Ρρ	Rho
Ζζ	Zeta	Σσς	Sigma
Ηη	Eta	Ττ	Tau
Θθ	Theta	Υυ	Upsilon
Ιι	Iota	Φφ	Phi
Κκ	Kappa	Χχ	Chi
Λλ	Lambda	Ψψ	Psi
Μμ	Mu	Ωω	Omega
Obsolete letters
	Digamma		Qoppa
	San		Sampi
Other characters
	Stigma		Sho
	Heta

Greek diacritics

Epsilon (uppercase Ε, lowercase ε; Greek: Έψιλον) is the fifth letter of the Greek alphabet, corresponding phonetically to a close-mid front unrounded vowel /e/. In the system of Greek numerals it has a value of 5. It was derived from the Phoenician letter He . Letters that arose from Epsilon include the Roman E and Cyrillic Ye.

"Epsilon" (ἒ ψιλόν, "simple e") was coined in the Middle Ages to distinguish the letter from the diphthong αι, which started being pronounced the same way during the period of New Testament Greek.

The standard symbol for lowercase epsilon is the lunate epsilon ϵ^{[citation needed]} (\epsilon, $\epsilon\,$ , in LaTeX), which has its origins in Medieval Greek.

In mathematical notation, the minuscule open e symbol ɛ (\varepsilon, $\varepsilon$ , in LaTeX) from the extended Latin alphabet is often used interchangeably with the lunate epsilon.

The lunate epsilon ϵ is not to be confused with the set symbol $\in$ or falsely recognized as the lunate version Σ (Sigma).

It is also the primary letter used in Real Analysis.

Upper case: character code 0395 (or 494) Lower case: character code 03B5

Symbol

The upper-case Epsilon is not a commonly-used symbol outside of the Greek language because of its similarity to the Latin letter E.

The lower-case epsilon, ε/ϵ, or open e, ɛ, (see above) is used as the symbol for:

In mathematics (particularly calculus), an arbitrarily (or nearly so) small positive quantity is commonly denoted ε; see limit.
- By analogy with this, the late mathematician Paul Erdős also used the term "epsilons" to refer to children (Hoffman 1998, p. 4).
In mathematics, the Levi-Civita symbol.
In mathematics, to represent the dual numbers: a + bε, with ε²=0 and ε≠0.
In mathematics, sometimes used to denote the Heaviside step function
In set theory, the limit ordinal of the sequence $\omega,\omega^{\omega},\omega^{\omega^{\omega}},\dots$ .
In computing, the precision of a numeric data type and floating-point machine epsilon.
In computer science, the empty string, though different writers use a variety of other symbols for the empty string as well, including the lower case Greek letter lambda.
In physics, the permittivity of a medium.
In physics/electronics, the EMF of a circuit
In physics, the strain of a material (A ratio of extensions).
In automata theory, a transition that involves no shifting of an input symbol.
In astronomy, the fifth brightest (usually) star in a constellation. See Bayer designation.
In the International Phonetic Alphabet, the open-mid front unrounded vowel, (but generally written ɛ instead of ϵ) as in the English word "pet" (/pɛt/)
In astronomy, Epsilon is the name for Uranus' most distant and most visible ring.
In chemistry, the molar extinction coefficient of a chromophore.
In economics, ε refers to elasticity.
In linguistics, the symbol for an open-mid front unrounded vowel.

Fictional names

In the popular web series "Red vs. blue", Epsilon is the name of the AI assigned to freelancer Washington.
Epsilon in Malaysian Pale is the name of the second solo album released by Tangerine Dream leader Edgar Froese in 1975.
Epsilon is also an Australian light-powered female-looking robot that fought Pluto in an episode of Astro Boy.
Epsilon Eridani III is the planet that the spacestation Babylon 5 orbited in the eponymous sci-fi television series.
E-104 Epsilon is also the name of a robot in Sonic Adventure.
Epsilon is an otherworldy being in the book The Riddles of Epsilon by Christine Morton-Shaw.
"Epsilon 9" is the name of the Federation space station consumed by the V'ger cloud in Star Trek: The Motion Picture.
Epsilon is the name of an unlockable creature in the game Monster Rancher 2
In Greek it is used for Epsilon Team.
"Epsilon Mirror" is the name of one of Aika's moves in the video game Skies of Arcadia.
Epsilon is the leader of the Rebellion in Mega Man X: Command Mission
"The Epsilon Program" is a mysterious cult in the video game Grand Theft Auto: San Andreas by Game Developer Rockstar North. This cult is thought to be based on Scientology.
The Epsilon Project is a fictional experiment mentioned in the Dreamcast and Xbox versions of Dead or Alive 2 and is based around cloning.
Epsilon is the lowest of five social castes in the Aldous Huxley novel Brave New World.
"Plan Epsilon" was one of many plans to restore Doctor Doom to life in the event of his death, as shown in Fantastic Four issue no. 246, written by Stan Lee.
Epsilon-Eagle is the name of the protagonist in the Sega Mega Drive game Alien Soldier.
Epsilon was the name given to one of the ground support teams in the Sony Playstation game G-Police
Epsilon is the name of the newly resurrected Yuri Faction in the Yuri's Revenge mod Mental Omega
Epsilon was one of the warriors of Asgard in the Anime series Saint Seiya, Fenrir Epsilon, The Northern Wolf, when Dragon Shiryu had to fight for his life against him on his way to rescue Hilda.

Other uses

"Epsilon[1]" is a marketing services firm.
"Epsilon" is the name used by General Motors for the post-2003 Epsilon platform.
EpsilonEuskadi carmaker ^[1] and EpsilonEuskadi LMP1 car.
"Barazi Epsilon" a manufacturer in the 2009 Superleague Formula season for the Olympique Lyonnais car.
Hurricane Epsilon, a storm of the 2005 Atlantic hurricane season.
"Epsilon Concepts"[2] is the name of a digital agency founded by Robby Berthume and based in Los Angeles, CA, USA.
Epsilon TB-30 is a training aircraft made by Socata and used by the French, Portuguese, Senegalese and Togo airforces. Introduced in 1984 it provides basic and intermediate training, and has a 300 hp lycoming engine.
Epsilon is also a Internet Flash game on Newgrounds.com
Epsilon symbol is also used to represent the "photosynthetic efficiency" of a particular plant or crop.

References

Hoffman, Paul; The man who loved only numbers. Hyperion, 1998. ISBN 0-7868-6362-5.

^ EPSILON EUSKADI==JOAN VILLADELPRAT & SERGIO RINLAND & JORDI CATON==AZKOITIA (43º 10' 22" N - 2º 19' 26" O)

Categories: Greek letters | Vowel letters

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