# Commute

• 121Quaternions and spatial rotation — Unit quaternions provide a convenient mathematical notation for representing orientations and rotations of objects in three dimensions. Compared to Euler angles they are simpler to compose and avoid the problem of gimbal lock. Compared to&#8230; …

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• 122Inland Empire (California) — For other uses, see Inland Empire. Inland Empire Riverside San Bernardino Ontario &#160;&#160;Metropolitan Area&#160;&#160; Riverside …

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• 123Caltrain — Infobox Public transit name = Caltrain imagesize=193 locale = San Francisco to Gilroy, California transit type = Commuter rail began operation = 1987 system length = 77.4 mi (125 km) lines = 1 stations = 32 ridership = 36,993cite news title =&#8230; …

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• 124Coxeter group — In mathematics, a Coxeter group, named after H.S.M. Coxeter, is an abstract group that admits a formal description in terms of mirror symmetries. Indeed, the finite Coxeter groups are precisely the finite Euclidean reflection groups; the symmetry …

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• 125Spin-statistics theorem — Statistical mechanics Thermodynamics&#160;· …

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• 126Polynomial ring — In mathematics, especially in the field of abstract algebra, a polynomial ring is a ring formed from the set of polynomials in one or more variables with coefficients in another ring. Polynomial rings have influenced much of mathematics, from the …

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• 127Southern Pacific Transportation Company — Infobox rail railroad name=Southern Pacific Transportation Company logo filename=SP logo.png logo size=150 marks=SP locale=Arizona, California, Louisiana, Nevada, New Mexico, Oregon, Texas,Utah, Colorado, Arkansas, Oklahoma, Kansas, Missouri,&#8230; …

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• 128Symmetry of second derivatives — In mathematics, the symmetry of second derivatives (also called the equality of mixed partials) refers to the possibility of interchanging the order of taking partial derivatives of a function of n variables. If the partial derivative with&#8230; …

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