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  2. Born rule - Wikipedia

    en.wikipedia.org/wiki/Born_rule

    The Born rule is a postulate of quantum mechanics that gives the probability that a measurement of a quantum system will yield a given result. In one commonly used application, it states that the probability density for finding a particle at a given position is proportional to the square of the amplitude of the system's wavefunction at that position.

  3. Quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics

    Quantum mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms. [2]: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science. Quantum mechanics can describe many systems that classical physics cannot.

  4. Measurement in quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Measurement_in_quantum...

    The old quantum theory is a collection of results from the years 1900–1925 [23] which predate modern quantum mechanics. The theory was never complete or self-consistent, but was rather a set of heuristic corrections to classical mechanics. [24] The theory is now understood as a semi-classical approximation [25] to modern quantum mechanics. [26]

  5. Copenhagen interpretation - Wikipedia

    en.wikipedia.org/wiki/Copenhagen_interpretation

    Quantum mechanics is intrinsically indeterministic. The correspondence principle: in the appropriate limit, quantum theory comes to resemble classical physics and reproduces the classical predictions. The Born rule: the wave function of a system yields probabilities for the outcomes of measurements upon that system.

  6. Gleason's theorem - Wikipedia

    en.wikipedia.org/wiki/Gleason's_theorem

    In mathematical physics, Gleason's theorem shows that the rule one uses to calculate probabilities in quantum physics, the Born rule, can be derived from the usual mathematical representation of measurements in quantum physics together with the assumption of non-contextuality.

  7. Interpretations of quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Interpretations_of_quantum...

    The definition of quantum theorists' terms, such as wave function and matrix mechanics, progressed through many stages.For instance, Erwin Schrödinger originally viewed the electron's wave function as its charge density smeared across space, but Max Born reinterpreted the absolute square value of the wave function as the electron's probability density distributed across space; [3]: 24–33 ...

  8. Victims' lawyer questions timing of dementia diagnosis of ex ...

    www.aol.com/victims-lawyer-questions-timing...

    A lawyer for sex trafficking victims in a ring allegedly run by ex-Abercrombie & Fitch CEO Mike Jeffries has doubts about claims he has dementia.

  9. Cauchy–Born rule - Wikipedia

    en.wikipedia.org/wiki/Cauchy–Born_rule

    The Cauchy–Born rule or Cauchy–Born approximation is a basic hypothesis used in the mathematical formulation of solid mechanics which relates the movement of atoms in a crystal to the overall deformation of the bulk solid.