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Epsilon (US: / ˈ ɛ p s ɪ l ɒ n /, [1] UK: / ɛ p ˈ s aɪ l ə n /; [2] uppercase Ε, lowercase ε or ϵ; Greek: έψιλον) is the fifth letter of the Greek alphabet, corresponding phonetically to a mid front unrounded vowel IPA: or IPA:.
The letter epsilon can occur in two equally frequent stylistic variants, either shaped ('lunate epsilon', like a semicircle with a stroke) or (similar to a reversed number 3). The symbol ϵ (U+03F5) is designated specifically for the lunate form, used as a technical symbol.
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
Archaic letter denoting the presence of /h/ prior to the vowel, with a high pitch on a short vowel or rising pitch on a long vowel Ἓἓ: Epsilon with grave and rough breathing: Archaic letter denoting the presence of /h/ prior to the vowel, with a normal or low pitch Ε̠ε̠: Epsilon with macron below: Arvanitika letter for /ə/ [7] Ζ̌ζ̌ ...
The normal letter epsilon (Ε) was used exclusively for the latter, while a new special symbol (or, in Sicyon, ) stood both for short /e/ and for /ɛː/. Yet another variation of the system is found in neighbouring Tiryns : it uses the letter forms of the Corinthian system, versus E, but with the functional values of the classic eta versus ...
Latin epsilon or open E (majuscule: Ɛ, minuscule: ɛ) is a letter of the extended Latin alphabet, based on the lowercase of the Greek letter epsilon (ε).
The Greek spelling alphabet is a spelling alphabet (or "phonetic alphabet") for Greek, i.e. an accepted set of easily differentiated names given to the letters of the alphabet for the purpose of spelling out words.
Historically, upper-case letters were used for representing points in geometry, and lower-case letters were used for variables and constants. Letters are used for representing many other sorts of mathematical objects. As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are