c數(英語:c-number)是狄拉克中文保羅·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變的量(一般是純量),和對應的是q數,q數不滿足乘法交換律中文乘法交換律,一般是算符中文算符

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