Numbers

C-number

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) (Wikipedia).

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Introduction to the C programming language. Part of a larger series teaching programming. See http://codeschool.org

From playlist The C language

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From playlist The C language

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This tutorial is part 4 of a playlist about prime numbers. Parts 3 and 4 show how to find all prime numbers from a starting number to a stopping number by writing a C++ program. Join this channel to get access to perks: https://www.youtube.com/channel/UCn2SbZWi4yTkmPUj5wnbfoA/join :)

From playlist How to Determine if a Number is a Prime Number C++

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How to Determine if a Number is a Prime Number by Writing a Computer Program , C++ , Part 2

This tutorial is part 2 of a playlist showing how to determine if a number is prime or not by writing a C++ program. Join this channel to get access to perks: https://www.youtube.com/channel/UCn2SbZWi4yTkmPUj5wnbfoA/join :)

From playlist How to Determine if a Number is a Prime Number C++

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This tutorial is part 3 of a playlist about prime numbers. Parts 3 and 4 show how to find all prime numbers from a starting number to a stopping number by writing a C++ program. Join this channel to get access to perks: https://www.youtube.com/channel/UCn2SbZWi4yTkmPUj5wnbfoA/join :)

From playlist How to Determine if a Number is a Prime Number C++

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This tutorial is part 1 of a playlist showing how to determine if a number is prime or not by writing a C++ program. Join this channel to get access to perks: https://www.youtube.com/channel/UCn2SbZWi4yTkmPUj5wnbfoA/join :)

From playlist How to Determine if a Number is a Prime Number C++

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Related pages

Complex number | Grassmann number | Real number