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  • 71String theory — This article is about the branch of theoretical physics. For other uses, see String theory (disambiguation). String theory …

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  • 72Nash embedding theorem — The Nash embedding theorems (or imbedding theorems), named after John Forbes Nash, state that every Riemannian manifold can be isometrically embedded into some Euclidean space. Isometric means preserving the length of every path. For instance,… …

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  • 73Mapping class group — In mathematics, in the sub field of geometric topology, the mapping class group is an important algebraic invariant of a topological space. Briefly, the mapping class group is a discrete group of symmetries of the space. Contents 1 Motivation 2… …

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  • 74Diesel engine — Diesel engines in a museum Diesel generator on an oil tanker …

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  • 75Bernhard Riemann — Infobox Scientist name =Bernhard Riemann box width =300px image width =225px caption =Bernhard Riemann, 1863 birth date =September 17, 1826 birth place =Breselenz, Germany death date =death date and age|1866|7|20|1826|9|17 death place =Selasca,… …

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  • 76Perturbation 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 …

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  • 77Whitney immersion theorem — In differential topology, the Whitney immersion theorem states that for m > 1, any smooth m dimensional manifold can be immersed in Euclidean 2m − 1 space. Equivalently, every smooth m dimensional manifold can be immersed in the 2m − 1… …

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  • 78List of mathematics articles (P) — NOTOC P P = NP problem P adic analysis P adic number P adic order P compact group P group P² irreducible P Laplacian P matrix P rep P value P vector P y method Pacific Journal of Mathematics Package merge algorithm Packed storage matrix Packing… …

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  • 79Petrov classification — In differential geometry and theoretical physics, the Petrov classification describes the possible algebraic symmetries of the Weyl tensor at each event in a Lorentzian manifold.It is most often applied in studying exact solutions of Einstein s… …

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  • 80Nordström's theory of gravitation — In theoretical physics, Nordström s theory of gravitation was a predecessor of general relativity. Strictly speaking, there were actually two distinct theories proposed by the Finnish theoretical physicist Gunnar Nordström, in 1912 and 1913… …

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