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.
References
External links
''WordWeb Online ''
{{quantum-stub
Numbers
Quantum mechanics