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C-number

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For the use of C-numbers for the classification of Corydoras species, see Corydoras.

The term C-number is an old nomenclature used by Paul Dirac to distinguish between real or complex numbers (c-numbers or classical numbers) and operators (q-numbers or quantum numbers) in quantum mechanics.

Although c-numbers are commuting, in physics the term anti-commuting c-number is used to refer to a type of anti-commuting numbers that are mathematically described by Grassmann numbers.

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