# 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: 7 Search : symbol
 Christoffel symbol   نماد ِ کریستوفل   namâd-e Christoffel (#)Fr.: symbole de Christoffel   A abbreviated notation for various functions associated with quadratic differential forms. Each Christoffel symbol is essentially a triplet of three indices, i, j and k, where each index can assume values from 1 to 2 for the case of two variables, or from 1 to n in the case of a quadratic form in n variables. Christoffel symbols appear in many calculations in geometry where non-Cartesian coordinates are used. These symbols are fundamental in the study of tensor analysis.Named after Elwin Bruno Christoffel (1829-1900), a German mathematician; → symbol. predicate symbol   نماد ِ فراسن   nemâd-e farâsanFr.: symbole de prédicat   In a → formal language, a letter used to describe a → predicate or → relation. Also called → relation symbol.→ predicate; → symbol. propositional symbol   نماد ِ گزاره‌ای   nemâd-e gozâreyiFr.: symbole propositionnel   An upper case letter, e.g. "A," "B," "C," etc. representing a → proposition. Propositional symbols are divisible into two sorts: → propositional constants and → propositional variables.→ propositional; → symbol. relation symbol   نماد ِ باز‌آنش   nemâd-e bâzânešFr.: symbole de relation   Same as → predicate symbol.→ relation; → symbol. symbol   نماد   namâd (#)Fr.: symbole   1) Something that stands for or represents something else, especially an object representing an abstraction. 2) A conventional sign or character that represents something in a specific context, e.g. an operation or quantity in mathematics or music.M.E., from L.L. symbolum "creed, token, mark," from Gk. symbolon "sign, mark," from → syn- "together" + stem of ballein "to throw."Namâd variant of namud, nemud past stem of nemudan "to show;" Mid.Pers. nimūdan, nimây- "to show," from O.Pers./Av. ni- "down; into," → ni- (PIE), + māy- "to measure;" cf. Skt. mati "measures," matra- "measure;" Gk. metron "measure;" L. metrum; PIE base *me- "to measure." symbolic   نمادین   nemâdin (#)Fr.: symbolique   Of or relating to a symbol or symbols; serving as a symbol.→ symbol; → -ic. symbolic logic   گوییک ِ نمادین   guyik-e nemâdinFr.: logique symbolique   A modern development of → formal logic based on a system of → symbols and → axiomatics in accordance with precise rules. It uses a formalized → artificial language to avoid the ambiguities and logical inadequacies of → natural languages. Symbolic logics are → polyvalent when they admit → truth values other than → true and → false.→ symbolic; → logic.