# 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: 9 Search : simple
 simple   ساده   sâdé (#)Fr.: simple   1) Chem.: Composed of only one → substance or → element. 2) Math.: Consisting of, involving, or describable by → terms of the → first degree. 3) Music: Uncompounded or without overtones.M.E., from O.Fr. simple, from L. simplus "simple, single," variant of simplex, from PIE root *sem- "one, together;" cf. Pers. ham "together," → com-, Skt. sam "together;" + *plac- "-fold," from PIE *plek- "to plait," → multiply.Sâdé "simple, unmixed, smooth, erased, plain;" cf. Khotanese sāta- "smooth;" Baluchi sāt/sāy-, sāh- "to shave;" Av. si-, sā- "to sharpen, cut;" Skt. śā- "to sharpen, whet" (Cheung 2007); see also → precise. simple event   رویداد ِ ساده   ruydâd-e sâdéFr.: événement simple   Statistics: An event consisting of a single point of the → sample space.→ simple; → event. simple fraction   برخه‌ی ِ ساده   barxe-ye sâdéFr.: fraction simple   A fraction in which the → numerator and → denominator are positive → integer numbers. Compare → compound fraction.→ simple; → fraction. simple harmonic motion   جنبش ِ هماهنگ ِ ساده   jonbeš-e hamâhang-e sâdéFr.: mouvement harmonique   The motion of a body subjected to a restraining force which is directly proportional to the displacement from a fixed point in the line of motion. The equation of simple harmonic motion is given by x = A sin(ωt + θ0), where x is the body's displacement from equilibrium position, A is the → amplitude, or the magnitude of harmonic oscillations, ω is the → angular frequency, t is the time elapsed, and θ0 is the → initial phase angle.→ simple; → harmonic; → motion. simple harmonic oscillator   نوشگر ِ هماهنگ ِ ساده   navešgar-e hamâhang-e sâdéFr.: oscillateur harmonique simple   An oscillator whose force is proportional to its extension, according to → Hooke's law. The way the oscillator moves is called → simple harmonic motion.→ simple; → harmonic; → oscillator. simple population   پرینش ِ ساده   porineš-e sâdéFr.: population simple   A set of stars resulting from a spatially (≤ few pc) and temporally (≤ Myr) correlated star formation event.→ simple; → population. simple root   ریشه‌ی ِ ساده   riše-ye sâdéFr.: racine simple   A → rootx0 of function f(x), if f(x0) = 0 and df/dx | x0 = 0. See also → double root.→ simple; → root. simplex   تکتافت   taktâftFr.: simplexe   A generalization of the simplest closed configuration that can be made from straight line segments. For example, a → triangle is a 2-simplex because it is in two → dimensions, and → tetrahedron is a 3-simplex because it is in three dimensions (Steven Schwartzman, An Etymological Dictionary of Mathematical Terms Used in English, 1994).Simplex, literally "uncomplicated, → simple," from sim-, from PIE root *sem- "one, once, together" + plek- "to fold." "folded [only] once."Taktâft, literally "folded once," from tak "→ single, alone," + tâft, contraction of tâfté "plated, twisted, fold," as in hamtâft, → complex. simplex method   روش ِ تکتافتی   raveš-e taktâftiFr.: méthode du simplexe   An → algorithm for solving the classical → linear programming problem; developed by George B. Dantzig in 1947. The simplex method is an → iterative method, solving a system of → linear equations in each of its steps, and stopping when either the → optimum is reached, or the solution proves infeasible. The basic method remained pretty much the same over the years, though there were many refinements targeted at improving performance (e.g. using sparse matrix techniques), numerical accuracy and stability, as well as solving special classes of problems, such as mixed-integer programming (Free On-Line Dictionary of Computing, FOLDOC).→ simplex; → method.