About: C-number

An Entity of Type: Biological database, from Named Graph: http://dbpedia.org, within Data Space: dbpedia.org

The term Number C (or C number) is an old nomenclature used by Paul Dirac which refers to real and complex numbers. It is used to distinguish from operators (q-numbers or quantum numbers) in quantum mechanics. Although c-numbers are commuting, the term anti-commuting c-number is also used to refer to a type of anti-commuting numbers that are mathematically described by Grassmann numbers. The term is also used to refer solely to "commuting numbers" in at least one major textbook. — G. B. Folland, Quantum Field Theory: A Tourist Guide for Mathematicians (2008)

Property Value
dbo:abstract
  • The term Number C (or C number) is an old nomenclature used by Paul Dirac which refers to real and complex numbers. It is used to distinguish from operators (q-numbers or quantum numbers) in quantum mechanics. Although c-numbers are commuting, the term anti-commuting c-number is also used to refer to a type of anti-commuting numbers that are mathematically described by Grassmann numbers. The term is also used to refer solely to "commuting numbers" in at least one major textbook. In the early days of quantum mechanics when the idea that observables are represented by noncommuting operators was still new and strange, some people spoke of quantum observables as "quantities whose values are q-numbers" — the notion of "q-number" being meant to suggest noncommutativity — as opposed to "quantities whose values are c-numbers," i.e., ordinary complex-valued quantities whose algebra is commutative. One still finds the terms q-number (rarely) and c-number (more frequently) in the physics literature; in particular, to say that an operator is a c-number is to say that it is a scalar multiple of the identity. (E.g., "The commutator of A and B is just a c-number.") — G. B. Folland, Quantum Field Theory: A Tourist Guide for Mathematicians (2008) (en)
  • С-число — термин квантовой механики, который обозначает вещественные и комплексные числа, в отличие от Q-чисел, или квантовых чисел, которые обозначают операторы. Введён в науку Полем Дираком. Хотя c-числа коммутируют, термин "антикоммутирующее c-число" также используется для обозначения типа антикоммутирующих чисел, которые математически описываются числами Грассмана. Этот термин также используется исключительно для обозначения "коммутирующих чисел" по крайней мере в одном крупном учебнике. В первые дни квантовой механики, когда идея о том, что наблюдаемые объекты представлены некоммутативными операторами, была ещё новой и странной, некоторые люди говорили о квантовых наблюдаемых как о "величинах, значения которых являются g-числами" — понятие "g-числа" должно было предполагать некоммутативность — в противоположность "величинам, значения которых являются c-числами", т. е. обычным комплекснозначным величинам, алгебра которых коммутативна. В литературе по физике до сих пор встречаются термины q-число (редко) и c-число (чаще); в частности, чтобы сказать, что оператор с-числа означает, что он является скалярным кратным тождества. (Например, "коммутатор A и B-это просто c-число.") (ru)
  • O termo Número C (ou C-número) é uma nomenclatura antiga usada por Paul Dirac que se refere a números reais e complexos. É usado para distinguir de operadores (números quânticos) na mecânica quântica. Embora os números c sejam comutados, o termo número c anticomutação também é usado para se referir a um tipo de números anticomutação que são descritos matematicamente pelos . O termo também é usado para se referir apenas a "números de comutação". (pt)
  • c數(英語:c-number)是狄拉克用過的一種命名法,用來表示量子力學中可以交換相乘次序而結果不变的量(一般是純量),和對應的是q數,q數不滿足乘法交換律,一般是算符。 (zh)
dbo:wikiPageExternalLink
dbo:wikiPageID
  • 13004986 (xsd:integer)
dbo:wikiPageLength
  • 1885 (xsd:nonNegativeInteger)
dbo:wikiPageRevisionID
  • 1081364978 (xsd:integer)
dbo:wikiPageWikiLink
dbp:author
  • G. B. Folland (en)
dbp:source
  • Quantum Field Theory: A Tourist Guide for Mathematicians (en)
dbp:text
  • In the early days of quantum mechanics when the idea that observables are represented by noncommuting operators was still new and strange, some people spoke of quantum observables as "quantities whose values are q-numbers" — the notion of "q-number" being meant to suggest noncommutativity — as opposed to "quantities whose values are c-numbers," i.e., ordinary complex-valued quantities whose algebra is commutative. One still finds the terms q-number and c-number in the physics literature; in particular, to say that an operator is a c-number is to say that it is a scalar multiple of the identity. (en)
dbp:wikiPageUsesTemplate
dcterms:subject
gold:hypernym
rdf:type
rdfs:comment
  • O termo Número C (ou C-número) é uma nomenclatura antiga usada por Paul Dirac que se refere a números reais e complexos. É usado para distinguir de operadores (números quânticos) na mecânica quântica. Embora os números c sejam comutados, o termo número c anticomutação também é usado para se referir a um tipo de números anticomutação que são descritos matematicamente pelos . O termo também é usado para se referir apenas a "números de comutação". (pt)
  • c數(英語:c-number)是狄拉克用過的一種命名法,用來表示量子力學中可以交換相乘次序而結果不变的量(一般是純量),和對應的是q數,q數不滿足乘法交換律,一般是算符。 (zh)
  • The term Number C (or C number) is an old nomenclature used by Paul Dirac which refers to real and complex numbers. It is used to distinguish from operators (q-numbers or quantum numbers) in quantum mechanics. Although c-numbers are commuting, the term anti-commuting c-number is also used to refer to a type of anti-commuting numbers that are mathematically described by Grassmann numbers. The term is also used to refer solely to "commuting numbers" in at least one major textbook. — G. B. Folland, Quantum Field Theory: A Tourist Guide for Mathematicians (2008) (en)
  • С-число — термин квантовой механики, который обозначает вещественные и комплексные числа, в отличие от Q-чисел, или квантовых чисел, которые обозначают операторы. Введён в науку Полем Дираком. Хотя c-числа коммутируют, термин "антикоммутирующее c-число" также используется для обозначения типа антикоммутирующих чисел, которые математически описываются числами Грассмана. Этот термин также используется исключительно для обозначения "коммутирующих чисел" по крайней мере в одном крупном учебнике. (ru)
rdfs:label
  • C-number (en)
  • Número C (pt)
  • C-число (ru)
  • C數 (zh)
owl:sameAs
prov:wasDerivedFrom
foaf:isPrimaryTopicOf
is dbo:wikiPageWikiLink of
is owl:differentFrom of
is foaf:primaryTopic of
Powered by OpenLink Virtuoso    This material is Open Knowledge     W3C Semantic Web Technology     This material is Open Knowledge    Valid XHTML + RDFa
This content was extracted from Wikipedia and is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License