# Non-existence

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**Non-measurable set**— This page gives a general overview of the concept of non measurable sets. For a precise definition of measure, see Measure (mathematics). For various constructions of non measurable sets, see Vitali set, Hausdorff paradox, and Banach–Tarski… …92

**Non-Resident Violator Compact**— The Non Resident Violator Compact (NRVC) is an interstate compact used by 44 states in the United States to process traffic citations across state borders. Motorists cited for violations in a state that is not a member of the NRVC must post bail… …93

**Non-archimedean time**— A non Archimedean time theory of time is any theory that holds that there exist instants infinitely in the future or infinitely in the past. It is so called because, if the instants of such time are assigned numbers, the set of such numbers must… …94

**Non-standard model**— See also Interpretation (logic) In model theory, a discipline within mathematical logic, a non standard model is a model of a theory that is not isomorphic to the intended model (or standard model). If the intended model is infinite and the… …95

**non-Euclidean geometry**— geometry based upon one or more postulates that differ from those of Euclid, esp. from the postulate that only one line may be drawn through a given point parallel to a given line. [1870 75; NON + EUCLIDEAN] * * * Any theory of the nature of… …96

**Non-Archimedean time**— A non Archimedean time theory of time is any theory that holds that there exist instants infinitely in the future or infinitely in the past. It is so called because, if the instants of such time are assigned numbers, the set of such numbers must… …97

**Non-critical string theory: Lorentz invariance**— Usually non critical string theory is considered in frames of the approach proposed by Polyakov [1]. The other approach has been developed in [2] [3] [4]. It represents a universal method to maintain explicit Lorentz invariance in any quantum… …98

**Non-standard arithmetic**— In mathematical logic, a nonstandard model of arithmetic is a model of (first order) Peano arithmetic that contains nonstandard numbers. The standard model of arithmetic consists of the set of standard natural numbers {0, 1, 2, hellip;}. The… …99

**Non-use value**— The concept of non use value refers to the value that people derive from economic goods (including public goods or natural resources) independent of any use, present or future, that people might make of those goods. These are generally… …100

**Non-linear sigma model**— In quantum field theory, a nonlinear σ model describes a scalar field Σ which takes on values in a nonlinear manifold called the target manifold T. The target manifold is equipped with a Riemannian metric g. Σ is a differentiable map from… …