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algebraic jabri (#) Fr.: algébrique Relating to, involving, or according to the laws of algebra. |
algebraic equation hamugeš-e jabri Fr.: équation algébrique An equation in the form of P = 0, where P is a → polynomial having a finite number of terms. |
algebraic function karyâ-ye jabri Fr.: fonction algébrique A function expressed in terms of → polynomials and/or roots of polynomials. In other words, any function y = f(x) which satisfies an equation of the form P_{0}(x)y^{n} + P_{1}(x)y^{n - 1} + ... + P_{n}(x) = 0, where P_{0}(x), P_{1}(x), ..., P_{n}(x) are polynomials in x. |
algebraic number adad-e jabri (#) Fr.: nombre algébrique A number, → real or → complex, that is a → root of a → non-zero polynomial equation whose → coefficients are all → rational. For example, the root x of the polynomial x^{2} - 2x + 1 = 0 is an algebraic number, because the polynomial is non-zero and the coefficients are rational numbers. The imaginary number i is algebraic, because it is the solution to x^{2} + 1 = 0. |
Algenib (γ Pegasi) Aljanb (#) Fr.: Algenib A star which lies at the lower left-hand corner of → Pegasus. Its apparent magnitude varies between +2.80 and +2.86 over a period of 3.6 hours; → spectral type B2 IV. Algenib, from Ar. Aljanb al-Faras "the horse's flank," from al "the" + janb "flank" + faras "horse". |
Algieba (γ Leo) Jebhé (#) Fr.: Algieba A binary system in Leo the brighter component of which (magnitude 2.6) is a giant K star and the partner a giant G (magnitude 3.8). The angular separation of just over 4'' means that the two stars are at least 170 AU apart, for a distance of 126 → light-years, and have an orbital period of over 500 years. Algieba, from Ar. Al-Jabhah "the forehead" (of the Lion). |
Algol (β Persei) Alqul, Ra's-ol-Qul (#) Fr.: Algol A variable star in the constellation → Perseus, which was the first eclipsing binary discovered. Its brightness varies between 2.2 and 3.5 magnitudes. Lying at a distance of about 82 → light-years, it consists of at least three components. The brightest component (A) is of spectral type B8 V, and the second one (B) a K type giant. The components A and B turn around each other with a period of about 68.8 hours. Algol, from Ar. Ra's al-ghul "the ghoul's head". |
Algol-type variables vartandegân-e Alqulguné Fr.: variables de type Algol The same as eclipsing binary stars, the prototype of which is Algol. |
algorithm xârazmik (#) Fr.: algorithme 1) A step-by-step problem-solving procedure, especially an established,
recursive computational procedure for solving a problem in a
finite number of steps. From M.L. algorismus, a mangled transliteration of al-Khwarizmi, "native of Khwarazm," the surname of the Persian mathematician and astronomer Abu Ja'far Mohammad ibn Musa al-Khwarizmi (c780-c850). Xârazmik, from Xârazmi (or Xwârazmi, from Xwârazm), the name of the Persian mathematician, + Persian affix → -ik, → -ics. |
alias anyâ Fr.: alias General:An assumed name; otherwise called. From L. alius "(an)other". Compare with Skt. anya "other, different," Av. anya-, O.Pers. aniya- "the one or the other," Arm. ail, Gk. allos "another," Goth. aljis "other". PIE *al- "beyond". Anyâ from Mid.Pers. anya "other, otherwise," from Av. anya "other". This term is used as eyni in the Modern Persian Aftari dialect: eyni sâl "other year," eyni vacé "other child". |
aliasing anyâyi Fr.: réplication The condition that two or more functions are indistinguishable because they have the same values at a finite set of points. Such functions are said to be aliases of each others. The aliasing problem often occurs in undersampled discrete Fourier transform. Aliasing, from → alias + → -ing. Anyâyi, from anyâ, → alias, + noun forming suffix -i. |
alidade ezâdé (#) Fr.: alidade 1) In a → planispheric astrolabe,
the small revolving rod fixed to the center of
the goniometric scale plotted on the → front
or → back of the instrument.
Unlike the → rule,
the alidade has little vanes with holes or slots at each
end, called → pinnules, which are used as sights,
through which the observer can aim at a particular object. An index, often consisting of
the edge of the alidade itself, shows on the goniometric scales the
angle between the line of sight of the targeted object and a
predetermined axis, i.e. the vertical of the observation locality
(online museo galileo, VirtualMuseum). M.E. allidatha, alhidade, from L. alhidada, from Ar.
al-'izâda
( Ezâdé, from Ar. al-'izâda. |
alien bigâné (#), bigân Fr.: 1) espèce envahissante; 2) extraterrestre 1) A species not native to its environment; an introduced species. M.E., from O.Fr. alien "strange, foreign; a stranger, foreigner," from L. alienus "of or belonging to another, foreign, alien, strange," also, as a noun, "a stranger, foreigner," adjectival form of alius "(an)other," → alias; meaning "not of the Earth" first recorded 1920. Bigâné "alien, foreigner," from Mid.Pers. bêgânag, from bêg-, bê- "out, outside, apart" (cf. Sogd. bêk "out, outside, apart, except," bêk-dênê "heretic," literally "out of religion") + suffix -ânag. |
align âxatidan Fr.: aligner To arrange in a line or so as to be parallel; to adjust to produce a proper relationship or orientation. M.Fr. aligner, from O.Fr. aligner, from à "to" + ligner "to line," from L. lineare, from linea "linen thread, string, line;" → line. Âxatidan, from â- intesive and nuance prefix + xat, → line, + infinitive suffix -idan. |
align a telescope âxatidan-e durbin, ~ teleskop Fr.: aligner un télescope Setting the axis of a telescope parallel to prime directions. In equatorial mounting, they are made parallel with the Earth's axis of rotation and the equator respectively. → collimation. |
aligned âxatidé Fr.: aligné Arranged in a → straight line. Past participle of → align. |
aligned magnetic field meydân-e meqnâtisi-ye âxatidé Fr.: champ magnétique aligné A magnetic field whose lines of force are oriented along a particular direction or by a particular manner (axially, vertically; randomly, properly, etc.) → aligned; → magnetic field. |
alignment âxateš Fr.: alignement The fact of being in line or bringing into line. |
Alioth (ε Ursae Majoris) Jown (#) Fr.: Alioth The brightest of the seven stars that make up the → Big Dipper → asterism. Alioth shines at magnitude +1.77 from a distance of about 80 → light-years. It is a white star of → spectral type A0pCr. The spectrum of the star is characterized by abnormally strong lines of → chromium and → europium. Alioth, from Aliot, from Ar. Alyat ( Jown, from Ar. Jawn "black camel or horse". |
Alkaid (η Ursae Majoris) Qâed (#) Fr.: Alkaïd The second brightest star in → Ursa Major and the end star in the handle of the → Big Dipper. Alkaid is a blue B3V main sequence star of apparent magnitude of 1.86 and lies at about 100 → light-years. Alkaid "leader, chief," from Al-Qa'id al-Banat an-Na'ash "the leader of the daughters of the bier," from Banat "daughters" + Na'ash "bier". Banat an-Na'ash is the Ar. name of the constellation. Qâed from Ar. Al-Qa'id. |
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