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Encyclopedia > Psi (letter)
Look up Ψ, ψ in Wiktionary, the free dictionary.
Greek alphabet
Α α Alpha Ν ν Nu
Β β Beta Ξ ξ Xi
Γ γ Gamma Ο ο Omicron
Δ δ Delta Π π Pi
Ε ε Epsilon Ρ ρ Rho
Ζ ζ Zeta Σ σ ς Sigma
Η η Eta Τ τ Tau
Θ θ Theta Υ υ Upsilon
Ι ι Iota Φ φ Phi
Κ κ Kappa Χ χ Chi
Λ λ Lambda Ψ ψ Psi
Μ μ Mu Ω ω Omega
Obsolete letters
Ϝ ϝ Digamma Ϻ ϻ San
Ϙ ϙ Qoppa Ϡ ϡ Sampi
Ϛ ϛ Stigma Ϸ ϸ Sho
For other uses, see Psi.

Psi (upper case Ψ, lower case ψ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (like in English "lapse"). In Greek, this consonant cluster can occur in the syllable initial position. However, in most languages of the world this combination is not possible at the beginning of a syllable. In Latin, Greek words beginning with psi are transcribed by ps-, but seem to have been pronounced simply as s-, with a quiescent p. This pronunciation has affected that of Greek words beginning with the letter in most languages of the world (psychology is pronounced with a silent p for example). The name of the letter is pronounced [saɪ] ("sigh") in English. The letter was adopted into the Old Italic alphabet, and its shape is continued into the Algiz rune of the Elder Futhark. Wikipedia does not have an article with this exact name. ... Wiktionary is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... Image File history File links Greek_alphabet_psi. ... Because of technical limitations, some web browsers may not display some special characters in this article. ... Alpha (uppercase Α, lowercase α) is the first letter of the Greek alphabet. ... For other uses, see Nu. ... Beta (upper case Î’, lower case β) is the second letter of the Greek alphabet. ... Look up Ξ, ξ in Wiktionary, the free dictionary. ... Gamma (uppercase Γ, lowercase γ) is the third letter of the Greek alphabet. ... Omicron (upper case Ο, lower case ο, literally small o) is the 15th letter of the Greek alphabet. ... Look up Δ, δ in Wiktionary, the free dictionary. ... For other uses, see Pi (disambiguation) Pi (upper case Π, lower case Ï€ or Ï–) is the sixteenth letter of the Greek alphabet. ... For the 2005 hurricane, see Hurricane Epsilon. ... Rho (upper case Ρ, lower case ρ) is the 17th letter of the Greek alphabet. ... Zeta (upper case Ζ, lower case ζ) is the sixth letter of the Greek alphabet. ... For other uses, see Sigma (disambiguation). ... Look up Η, η in Wiktionary, the free dictionary. ... Tau (upper case Τ, lower case Ï„) is the 19th letter of the Greek alphabet. ... == // == Dimensionless temperature in transport phenomena. ... Upsilon (upper case , lower case ) is the 20th letter of the Greek alphabet. ... For programming language, see Iota and Jot. ... The letter phi Phi (upper case Φ or ; lower case φ, , or ), pronounced fee in Greek and fai as in defy in English, is the 21st letter of the Greek alphabet. ... For other uses, see Kappa (disambiguation). ... Chi (upper case Χ, lower case χ) is the 22nd letter of the Greek alphabet. ... Look up Λ, λ in Wiktionary, the free dictionary. ... For other uses, see Mu. ... Look up Ω, ω in Wiktionary, the free dictionary. ... Digamma (upper case , lower case ) is an archaic letter of the Greek alphabet, used primarily as a Greek numeral. ... San (uppercase , lowercase ) was a letter of the Greek alphabet, appearing between Pi and Qoppa in alphabetical order, corresponding in position although not in name to the Phoenician tsade. ... Qoppa Qoppa is an obsolete letter of the Greek alphabet and has a numeric value of 90. ... Sampi (Upper case Ϡ, lower case ϡ) is an obsolete letter of the Greek alphabet and has a numeric value of 900. ... Stigma is a ligature of the Greek letters sigma and tau, sometimes used nowadays to represent the Greek numeral 6. ... Sho (uppercase , lowercase ) was a letter added to the Greek alphabet in order to write the Bactrian language. ... In the Greek alphabet, vowels can carry diacritics, namely accents and breathings. ... Psi has multiple meanings: Psi (letter) (Ψ, ψ) of the Greek alphabet Psi (Cyrillic) (Ñ°, ѱ), letter of the early Cyrillic alphabet, adopted from Greek Psi (instant messenger), the popular Jabber client program J/ψ particle, a subatomic particle Schrödinger equation in quantum mechanics, ψ Ψ in mathematics is the angle between the tangent and the... Because of technical limitations, some web browsers may not display some special characters in this article. ... Greek numerals are a system of representing numbers using letters of the Greek alphabet. ... The History of Greece extends back to the arrival of the Greeks in Europe some time before 1500 BC, even though there has only been an independent state called Greece since Turkey, Italy and Libya. ... Main article: Greek language Modern Greek (Νέα Ελληνικά or Νεοελληνική, lit. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Note: This article contains special characters. ... Algiz is a reconstructed Proto-Germanic name for the ᛉ rune, representing Proto-Germanic final z. ... The 24 runes of the Elder Futhark The Elder Futhark (or Elder Fuþark, Older Futhark, Old Futhark) is the oldest form of the runic alphabet, used by Germanic tribes for Proto-Norse and other Migration period Germanic dialects of the 2nd to 8th centuries for inscriptions on artefacts (jewellery...

The letter may have originated from the practise of writing the sigma over the pi, eventually making the combination into a single letter. Psi was also adopted into the early Cyrillic alphabet. See psi (Cyrillic) (Ѱ, ѱ). For other uses, see Sigma (disambiguation). ... When a circles diameter is 1, its circumference is Ï€. The mathematical constant Ï€ is an irrational real number, approximately equal to 3. ... The original Cyrillic alphabet was a writing system developed in the First Bulgarian Empire in the tenth century to write the Old Church Slavonic liturgical language. ... Psi (Ñ°, ѱ) is a letter in the early Cyrillic alphabet, derived from the Greek letter psi (Ψ, ψ). It represents the sound /ps/, as in English naps, and was used largely in loan words from foreign languages. ...

The letter psi is commonly used in physics for representing a wavefunction in quantum mechanics, particularly with the Schrödinger equation and bra-ket notation: langlephi|psirangle. It is also used to represent the (generalized) positional states of a qubit in a quantum computer. Physics (from the Greek, (phúsis), nature and (phusiké), knowledge of nature) is the science concerned with the discovery and understanding of the fundamental laws which govern matter, energy, space, and time. ... This article discusses the concept of a wavefunction as it relates to quantum mechanics. ... Fig. ... In physics, the Schrödinger equation, proposed by the Austrian physicist Erwin Schrödinger in 1925, describes the space- and time-dependence of quantum mechanical systems. ... Bra-ket notation is the standard notation for describing quantum states in the theory of quantum mechanics. ... To meet Wikipedias quality standards and make it more accessible, this article needs a better explanation of technical details or more context regarding applications or importance to make it more accessible to a general audience, or at least to technical readers outside this specialty. ... The Bloch sphere is a representation of a qubit, the fundamental building block of quantum computers. ...

Psi is also used as the symbol for the polygamma function, defined by In mathematics, the polygamma function of order m is defined as the m+1 th derivative of the logarithm of the gamma function: Here is the digamma function and is the gamma function. ...

psi_n(x) = frac{d^{(n)}}{dx^{(n)}}frac{Gamma '(x)}{Gamma (x)},!

where Γ(x) is the gamma function. The Gamma function along part of the real axis In mathematics, the Gamma function extends the factorial function to complex and non integer numbers (it is already defined on the naturals, and has simple poles at the negative integers). ...

The letters Ψ or ψ can also be a symbol for:

  Results from FactBites:
PSI TECH Privacy Statement (1731 words)
PSI TECH, Inc. respects the privacy of all of its users and is committed to protecting such privacy in accordance with this Privacy Policy.
PSI TECH may also use Personal Information if it has reasonable grounds to believe the information could be useful when investigating a contravention of a federal, provincial or foreign law or in order to protect or defend a legal interest.
In connection with a PSI TECH corporate re-organization, merger or amalgamation with another entity, or a sale of all or a substantial portion of the assets of PSI TECH provided that the Personal Information disclosed continues to be used for the purposes permitted by this Privacy Policy by the entity acquiring the information.
PSI | Home (511 words)
PSI has written a letter to the FNA fully supporting its attempts to secure the pay and working conditions that Fiji’s nurses deserve.
The government has refused to negotiate since the unions went on strike early May. The public sector workers are asking for a re-evaluation of the public sector pay scale and an increase in the minumum wage and pensions.
PSI is appealing to its affiliated organisations to support its affiliate, the Sindicato de Empresa Trabajadores de ANDA (SETA) and write letters of protest to President Antonio Elías Saca condemning the recent acts of violence against participants of a public meeting to oppose water privatisation in El Salvador.
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