# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

Homepage

Number of Results: 7 Search : exponent
 exponent   نما   nemâ (#)Fr.: exposant   Math.: A symbol or number placed above and after another symbol or number (called the base) to denote the power to which the latter is to be raised. Examples: n in the expresseion an; 3 in the expression 23.From L. exponentem, pr.p. of exponere "put forth, explain," from → ex- "forth" + ponere "to put, to place."Nemâ, agent noun of nemudan "to show, display," from Mid.Pers. nimūdan, from ne- "down; into;" O.Pers./Av. ni- "down; into," → ni-, + mun, Av. māy- "to measure," → display. exponential   نمایی   nemâyi (#)Fr.: exponentiel   Of or expressed by a mathematical → exponent. → exponential curve, → exponential equation, → exponential function.→ exponent + -ial, variant of → -al. exponential curve   خم ِ نمایی   xam-e nemâyi (#)Fr.: courbe exponentielle   A curve that represents an → exponential function.→ exponential; → curve. exponential equation   هموگش ِ نمایی   hamugeš-e nemâyiFr.: équation exponentielle   An equation in which unknowns appear as exponents. Examples: 23x + 1 = 32.→ exponential; → equation. exponential function   کریای ِ نمایی   karyâ-ye nemâyiFr.: fonction exponentielle   A function in the form of y = bx defined for every → real number x, with positive base b > 1.→ exponential; → function. exponentially   نماییوار   nemâyivârFr.: exponentiellement   In an exponential manner.→ exponential; → -ly. gravity darkening exponent   نمای ِ تاریکش ِ گرانشی   nemâ-ye târikeš-e gerânešiFr.: exposant de l'assombrissement gravitationnel   The exponent appearing in the power law that describes the → effective temperature of a → rotating star as a function of the → effective gravity, as deduced from the → von Zeipel theorem or law. Generalizing this law, the effective temperature is usually expressed as Teff∝ geffβ, where β is the gravity darkening exponent with a value of 0.25. It has, however, been shown that the relation between the effective temperature and gravity is not exactly a power law. Moreover, the value of β = 0.25 is appropriate only in the limit of slow rotators and is smaller for fast rotating stars (Espinosa Lara & Rieutord, 2011, A&A 533, A43).→ gravity; → darkening; → exponent.