An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12 Search : value
 absolute value   ارزش ِ اوست   arzeš-e avastFr.: valeur absolue   For any → real number a, the non-negative value of a without regard to its sign; denoted by |a|. Same as → modulus. The absolute value of a is always either → positive or → zero, but never negative. The absolute value of a number may be thought of as its → distance from zero. The following rules hold: |ab| = |a||b| |a + b|  ≤  |a| + |b| |a - b|  ≥  |a| - |b| For a> 0, |x|  ≤  a if and only if -a  ≤  x  ≤  a.→ absolute; → value. discrete value   ارزش ِ گسسته   arzeš-e gosastéFr.: valeur discrète   A quantity that has certain magnitudes and does not represent a → continuous variable.→ discrete; → value. eigenvalue   ویژ ارزه   viž-arzéFr.: valeur propre   1) Math.: The one of the → scalars λ such that T(v) = λv, where T is a linear → operator on a → vector space, and v is an → eigenvector. 2) Quantum mechanics: The specified values of → quantized energy for which the → Schrodinger equation is soluble, subject to the appropriate → boundary conditions.→ eigenfunction; → value. expected value   ارزش ِ بیوسیده   arzeš- bayusidéFr.: valeur espérée   Statistics: Same as → mathematical expectation, → expectation.→ expectation; → value. half-value layer (HVL)   لایه‌ی ِ نیم-تنکش   lâye-ye nim-tonokešFr.: couche de demi-atténuation   The thickness of material required to reduce the intensity of an → X-ray beam to one half of its initial value. The HVL is an indirect measure of the photon energies of a beam.→ half; → value; → layer; → attenuation. mean value theorem   فربین ِ ارزش ِ میانگین   farbin-e arzeš-e miyânginFr.: théorème des accroissements finis   1) If f(x) is a continuous function on the interval from a to b, then: ∫ f(x) dx = f(c)(b - a) (summed from a to b) for at least one point in that interval. 2) More generally, If f(x) and g(x) are continuous functions on the interval from a to b and g(x)≥ 0, then: ∫ f(x)g(x) dx = f(c) ∫ g(x) dx (both integrals summed from a to b).→ mean; → value; → theorem. nominal value   ارزش ِ نامنال   arzeš-e nâmenâlFr.: valeur nominale   The assigned, specified, or intended value of a quantity.→ nominal; → value. place-value notation   نمادگان ِ جا-ارزشی   nemâdgân-e jâ-arezešiFr.: notation positionnelle   A mathematical notation system in which the → numerals get different values depending on their position relative to the other numerals. Same as → positional notation and → positional number system.→ place; → value; → notation. root-mean-square value   ارزش ِ ریشه‌ی ِ چاروشی ِ میانگین   arzeš-e riše-ye câruši-ye miyânginFr.: écart quadratique moyen, écart type   Statistics: The square root of the arithmetic mean of the squares of the deviation of observed values from their arithmetic mean.→ root; → mean; → square; → deviation. standard values   ارزش‌های ِ استانده   arzešhâ-ye estândéFr.: valeurs standard   Photometric values of selected stars in a standard system.→ standard; → value. truth value   ارزش ِ راستینی   arzeš-e râstiniFr.: valeur de vérité   The quality of a logical → proposition (or a formal → symbol) which describes the relation of a proposition to → truth. The traditional → formal logic admits only two contradictory values, → true or → false. In → symbolic logic, more specifically in → polyvalent logics, other truth values are used (such as possible, impossible, undetermined, probable, random, etc.).→ truth; → value. value   ارزش   arzeš (#)Fr.: valeur   Math.: Magnitude; quantity; a numerical quantity assigned to a mathematical symbol.M.E., from O.Fr. value "worth, value," noun use of feminine p.p. of valoir "be worth," from L. valere "be strong, be well, be of value."Arzeš, verbal noun of arzidan "to be worth," arzân "worthy; of small value, cheap," arj "esteem, honour, price, worth;" Mid.Pers. arz "value, worth," arzidan "be worth," arzân "valuable;" Av. arəjaiti "is worth," arəja- "valuable," arəg- "to be worth;" cf. Skt. arh- "to be worth, to earn," árhant- "worthy person;" Gk. alphanein "to bring in as profit," alphein "to ear, obtain;" Lith. algà "salary, pay;" PIE base *algwh- "to earn; price, value."