## Uncertainty principle

In quantum mechanics , the Heisenberg uncertainty **principle** states a fundamental limit on the accuracy with which certain pairs of physical properties of a particle, such as position and momentum , can be simultaneously known. In other words, the more precisely one property is measured,

**wikipedia.org**| 2011/10/4 4:46:24

## Correspondence principle

In physics , the correspondence **principle** states that the behavior of systems described by the theory of quantum mechanics (or by the old quantum theory ) reproduces classical physics in the limit of large quantum numbers. The **principle** was formulated by Niels Bohr in 1920, [ 1 ] though

**wikipedia.org**| 2011/4/23 11:08:34

## Pauli exclusion principle

The Pauli exclusion **principle** is the quantum mechanical **principle** that no two identical fermions (particles with half-integer spin ) may occupy the same quantum state simultaneously. A more rigorous statement is that the total wave function for two identical fermions is anti-symmetric

**wikipedia.org**| 2011/8/9 10:34:38

## Quantum mechanics

context of quantum mechanics, the wave–particle duality of energy and matter and the uncertainty **principle** provide a unified view of the behavior of photons , electrons and other atomic-scale objects. The mathematical formulations of quantum mechanics are abstract. Similarly, the implications

**wikipedia.org**| 2011/10/4 20:40:35

## Many-worlds interpretation

decoherence interpretations and the Copenhagen interpretation . Quantum mechanics Uncertainty **principle** Introduction Mathematical formulations Background Classical mechanics Old quantum theory Interference · Bra-ket notation Hamiltonian Fundamental concepts

**wikipedia.org**| 2011/9/30 1:58:23