- old quantum mechanics
*noun plural but singular or plural in construction*

*Useful english dictionary.
2012.*

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**Old quantum theory**— Quantum mechanics Uncertainty principle … Wikipedia**Quantum mechanics**— For a generally accessible and less technical introduction to the topic, see Introduction to quantum mechanics. Quantum mechanics … Wikipedia**Mathematical formulation of quantum mechanics**— Quantum mechanics Uncertainty principle … Wikipedia**Measurement in quantum mechanics**— Quantum mechanics Uncertainty principle … Wikipedia**Introduction to quantum mechanics**— This article is an accessible, non technical introduction to the subject. For the main encyclopedia article, see Quantum mechanics. Quantum mechanics … Wikipedia**Interpretation of quantum mechanics**— An interpretation of quantum mechanics is a statement which attempts to explain how quantum mechanics informs our understanding of nature. Although quantum mechanics has received thorough experimental testing, many of these experiments are open… … Wikipedia**History of quantum mechanics**— The history of quantum mechanics as this interlaces with history of quantum chemistry began essentially with the 1838 discovery of cathode rays by Michael Faraday, during the 1859 1860 winter statement of the black body radiation problem by… … Wikipedia**Perturbation theory (quantum mechanics)**— In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a … Wikipedia**Quantum entanglement**— Quantum mechanics Uncertainty principle … Wikipedia**Quantum gravity**— is the field of theoretical physics attempting to unify quantum mechanics, which describes three of the fundamental forces of nature (electromagnetism, weak interaction, and strong interaction), with general relativity, the theory of the fourth… … Wikipedia