# degeneracy

101

**Nuclear shell model**— In nuclear physics and nuclear chemistry, the nuclear shell model is a model of the atomic nucleus which uses the Pauli exclusion principle to describe the structure of the nucleus in terms of energy levels.[1] The first shell model was proposed… …102

**depravity**— I (New American Roget s College Thesaurus) n. degeneracy, corruption, turpitude, degradation, perversion. See badness, deterioration, impurity. II (Roget s IV) n. Syn. degradation, degeneracy, baseness, wickedness; see evil 1 . III (Roget s 3… …103

**Hamiltonian (quantum mechanics)**— In quantum mechanics, the Hamiltonian H is the observable corresponding to the total energy of the system. As with all observables, the spectrum of the Hamiltonian is the set of possible outcomes when one measures the total energy of a system.… …104

**Kolmogorov–Arnold–Moser theorem**— The Kolmogorov–Arnold–Moser theorem is a result in dynamical systems about the persistence of quasi periodic motions under small perturbations. The theorem partly resolves the small divisor problem that arises in the perturbation theory of… …105

**Molecular orbital**— See also: Molecular orbital theory In chemistry, a molecular orbital (or MO) is a mathematical function describing the wave like behavior of an electron in a molecule. This function can be used to calculate chemical and physical properties such… …106

**Particle in a box**— In physics, the particle in a box (also known as the infinite potential well or the infinite square well) is a problem consisting of a single particle inside of an infinitely deep potential well, from which it cannot escape, and which loses no… …107

**Brown dwarf**— Brown dwarfs are sub stellar objects which are too low in mass to sustain hydrogen 1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no… …108

**Shell model**— In nuclear physics, the nuclear shell model is a model of the atomic nucleus which uses the Pauli principle to describe the structure of the nucleus in terms of energy levels. The model was developed in 1949 following independent work by several… …109

**Perturbation theory**— This article describes perturbation theory as a general mathematical method. For perturbation theory as applied to quantum mechanics, see perturbation theory (quantum mechanics). Perturbation theory comprises mathematical methods that are used to …110

**Fermi–Dirac statistics**— Statistical mechanics Thermodynamics · …