Alpha

See also: Alpha (homonymy)

Alpha (capital tiny Α , α ), in Greek ἄλφα , letter of the Greek alphabet is the first and the ancestor of the letter has Alphabets Latin, and Cyrillic alphabet.

In the beginning, the name of this letter derives from the word aleph which indicates a Bœuf in Phénicien, a Semitic Langue whose speakers were at the origin of the Alphabet phenician from which the Greek alphabet derives (as well as the Semitic Abjad S of which the Hebrew , the Arab , the Avestique).

The shape of the letter Majuscule has in Greek (borrowed later by the Latin ), is itself an ox head having undergone a rotation of 90 degrees. Indeed, the shape of the letter as a phenician would come from the old demotic Egyptian writing, where this letter was represented by the image of an ox head, an origin also shared with the Copt alphabet, very near to the Greek alphabet.

Use

In Mathematical:
  • One notes sometimes a flat angle α - another current notation is θ.
  • One uses sometimes α as notation for " proportional à" : With αB siginifie B to A.
  • One is proportional uses α to represent the error of first species during tests of assumptions.

In Physical - Chemistry:

  • the radiation α is one of the three types of radioactive Rayonnement;
  • the Polarisabilité is generally noted α;
  • the Constante of fine structure is also noted α.
  • In electricity α is often used to note a cyclic report/ratio (time of conduction divided by the period of the signal)

In Astronomy:

  • Alpha generally indicates the most brilliant star of a Constellation (for example: Alpha of the Centaur).

In Data-processing:

  • the version alpha is a version of development of a software
  • DEC Alpha is a microprocessor of DEC
  • Alpha is a computer programming language for the parallel Calcul
  • the Alpha-reduction is a mechanism of the Lambda-calculation
  • Alpha is the name given to the rate of Transparence of a Image or a Couleur.

In Finance

  • alpha represents the adjusted relative performance of the systematic risk (beta) of a wallet or a financial credit. It corresponds to the constant of the linear regression by least squares between the outputs logarithmic curves of the wallet and that of an index of reference (benchmark). See also Ratio of Sharpe

Homonyms

In Aeronautical:
  • Alpha is the redundant word associated with the letter has in the Alphabet radio operator standardized by the ICAO.

In the education:

  • To be Alpha , in the jargon of the taupins, wants to say to be acceptable with the oral examination of an entrance examination in a University. This terminology comes from the jargon of the '' X ''; the X entered (in the years 1960) this school with the rank of candidate, rank whose distinctive shoulder pad, in Artillery, like nowadays in the Air force, was gold alpha on gray bottom. The fact of not being α was worth to be declared β , abbreviation disrespectful of fucked , word now standardized but at the time perceived as dared.
  • the plate Alpha , in a school, is the plate of presentation carried out by the pupils.

In Psychoanalysis:

  • For the psychoanalyst W.R. Bion, the function alpha makes it possible to transform the elements béta , i.e. rough elements, not integrated, nonelaborate by psychism, in elements alpha , elements thinkable, representable, symbolisables.

In zoology:

  • Alpha (Male alpha, Female alpha) designates the individual dominating of a group of animals, for example in a pack of wolf S or in a tribe of Chimpanzé S.

In Religion:

  • In the Christian religion, as also in the bible known as Seventy (delivers of Isaie), alpha and the Oméga, associated under the term Alpha and Omega is the symbols of the eternity of God (Apocalypse, 22:13), located at the beginning and the end (to be noted that if it there beginning and end, the concept of eternity takes a particular direction) of all things. These two letters were sometimes used by the first Christians on certain monuments. They are always reproduced on the Chrisme.
  • the Parcours Alpha is a program of Christian user-friendliness introduces into the dioceses of France

In arts and the culture:

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