# 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: 5 Search : notation
 Einstein notation   نمادگان ِ اینشتین   namâdgân-e EinsteinFr.: convention Einstein   A notation convention in → tensor analysis whereby whenever there is an expression with a repeated → index, the summation is done over that index from 1 to 3 (or from 1 to n, where n is the space dimension). For example, the dot product of vectors a and b is usually written as: a.b = Σ (i = 1 to 3) ai.bi. In the Einstein notation this is simply written as a.b = ai.bi. This notation makes operations much easier. Same as Einstein summation convention.→ Einstein; → notation. notation   نمادگان   namâdgân (#)Fr.: notation   Representation of numbers, quantities, or other entities by symbols; a system of symbols for such a purpose.From L. notationem (nom. notatio) "a marking, explanation," from notatus, p.p. of notare "to note."Namâdgân, from namâd, → symbol, + -gân suffix denoting order, organization, multiplicity. 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. positional notation   نمادگان ِ نهشی   nemâdgân-e nehešiFr.: notation positionnelle   A system of representing → numbers in which the → position of a → digit in a string of digits affects its value. The decimal system is a positional notation for expressing numbers. Same as → place-value notation and → positional number system.→ positional; → notation. scientific notation   نمادگان ِ دانشی، ~ دانشیک   namâdgân-e dâneši, ~ dânešikFr.: notation scientifique   A compact format for writing very large or very small numbers. Numbers are made up of three parts: the coefficient, the base and the exponent. For example 3.58 x 104 is the scientific notation for 35,800.→ scientific; → notation.