Notation

Notation

The term notation can refer to:

Written communication

• Phonographic writing systems, by definition, use symbols to represent components of auditory language, i.e. speech, which in turn refers to things or ideas. The two main kinds of phonographic notational system are the alphabet and syllabary. Some written languages are more consistent in their correlation of written symbol or grapheme and sound or phoneme, and are therefore considered to have better Phonemic orthography.
• Ideographic writing, by definition, refers to things or ideas independently of their pronunciation in any language. All of the notational systems listed below are ideographic. Some ideographic systems are also Pictograms that convey meaning through their pictorial resemblance to a physical object.

Chemistry

• Chemical formulas are a way of expressing information about the atoms that constitute a particular chemical compound, e.g. H2O or C6H12O6
• Structural formulas are graphical representations of the molecular structure, showing how the atoms are arranged
• Nuclear notation provides a convention in chemistry and physics to indicate the atomic number and mass number of an isotope.

Logic

A variety of symbols are used to express logical ideas; see the List of logic symbols

Mathematics

• Mathematical notation is used to represent various kinds of mathematical ideas.
• Systems to represent very large numbers
• Numeral systems, notation for writing numbers, including
• Arabic numerals
• Roman numerals
• Scientific notation for expressing large and small numbers
• Sign-value notation, using signs or symbols to represent numbers
• Positional notation also known as place-value notation, in which each position is related to the next by a multiplier which is called the base of that numeral system
• Binary notation, a positional notation in base two
• Octal notation, a positional notation in base eight, used in some computers
• Decimal notation, a positional notation in base ten
• Hexadecimal notation, a positional notation in base sixteen, commonly used in computers
• Sexagesimal notation, an ancient numeral system in base sixty
• See also Table of mathematical symbols - for general tokens and their definitions...

Music

• Musical notation permits a composer to express musical ideas in a musical composition, which can be read and interpreted during performance by a trained musician; there are many different ways to do this (hundreds have been proposed), although staff notation provides by far the most widely used Modern musical symbols.

Physics

• Bra-ket notation or Dirac Notation is another representation of probability in quantum mechanics
• Tensor notation is a general way to represent a gravitational field in general relativity
• Feynman Diagrams permit a graphical representation of a perturbative contribution to the transition amplitude or correlation function of a quantum mechanical or statistical field theory

Typographical conventions

• Infix notation, the common arithmetic and logical formula notation, such as a+b-c
• Polish notation or "prefix notation", which places the operator before the operands (arguments), such as + a b
• Reverse Polish notation or "postfix notation", which places the operator after the operands, such as a b +

Other systems

Various notations have been developed to specify regular expressions.

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• notation — [ nɔtasjɔ̃ ] n. f. • 1531 « décision »; lat. notatio 1 ♦ (1750) Action, manière de noter, de représenter par des symboles; système de symboles. Notation des nombres, notation numérique; notation par lettres. Notation littérale, algébrique, créée… …   Encyclopédie Universelle

• Notation — ist die Benennung von Gegenständen durch das Festhalten (qualitative und quantitative Repräsentation) von Dingen und Bewegungsverläufen in schriftlicher Form mit vereinbarten symbolischen Zeichen. Das Fehlen einer Notation macht es bisweilen… …   Deutsch Wikipedia

• Notation — No*ta tion, n. [L. notatio a marking, observing, etymology, fr. notare to mark, nota a mark: cf. F. notation. See 5th {Note}.] 1. The act or practice of recording anything by marks, figures, or characters. [1913 Webster] 2. Any particular system… …   The Collaborative International Dictionary of English

• notation — (n.) 1560s, explanation of a term, from M.Fr. notation and directly from L. notationem (nom. notatio) a marking, notation, designation; etymology; shorthand; explanation, noun of action from pp. stem of notare to note (see NOTE (Cf. note) (v.)).… …   Etymology dictionary

• notation — I noun annotation, chronicle, comment, commentary, entry, footnote, inscription, marginalia, memorandum, minute, note, record, register II index comment, marginalia, memorandum, reminder, symbol …   Law dictionary

• notation — [n] written remarks characters, chit, code, documentation, figures, jotting, memo, memorandum, note, noting, record, representation, script, signs, symbols, system; concepts 268,284 …   New thesaurus

• notation — ► NOUN 1) a system of written symbols used to represent numbers, amounts, or elements in a field such as music or mathematics. 2) a note or annotation. DERIVATIVES notate verb notational adjective …   English terms dictionary

• notation — [nō tā′shən] n. [L notatio < notare, to NOTE] 1. the use of a system of signs or symbols to represent words, phrases, numbers, quantities, etc. 2. any such system of signs or symbols, as in mathematics, chemistry, music, etc. 3. a brief note… …   English World dictionary

• Notation — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Notation », sur le Wiktionnaire (dictionnaire universel) La Notation est le fait de représenter, de… …   Wikipédia en Français

• Notation O — Comparaison asymptotique Pour les articles homonymes, voir Landau. En mathématiques et en informatique, la comparaison asymptotique de deux fonctions (ou de deux suites, etc.) consiste à étudier (le plus souvent au voisinage de l infini) la… …   Wikipédia en Français