# classifying

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**Clinical trial**— Clinical trials are a set of procedures in medical research and drug development that are conducted to allow safety (or more specifically, information about adverse drug reactions and adverse effects of other treatments) and efficacy data to be… …122

**Root system**— This article discusses root systems in mathematics. For root systems of plants, see root. Lie groups …123

**Von Neumann algebra**— In mathematics, a von Neumann algebra or W* algebra is a * algebra of bounded operators on a Hilbert space that is closed in the weak operator topology and contains the identity operator. They were originally introduced by John von Neumann,… …124

**Chern class**— In mathematics, in particular in algebraic topology and differential geometry, the Chern classes are characteristic classes associated to complex vector bundles. Chern classes were introduced by Shiing Shen Chern (1946). Contents 1 Basic… …125

**California Proposition 54 (2003)**— Proposition 54 was a proposition in the state of California on the October 7, 2003, special election ballot. It failed to pass with 3,144,145 (36.1%) votes in favor and 5,541,314 (63.9%) against. It was placed on the ballot through the initiative …126

**Grassmannian**— In mathematics, a Grassmannian is a space which parameterizes all linear subspaces of a vector space V of a given dimension. For example, the Grassmannian Gr 1( V ) is the space of lines through the origin in V , so it is the same as the… …127

**Cobordism**— A cobordism (W;M,N). In mathematics, cobordism is a fundamental equivalence relation on the class of compact manifolds of the same dimension, set up using the concept of the boundary of a manifold. Two manifolds are cobordant if their disjoint… …128

**Norrington Table**— The Norrington Table is an annual ranking that lists the colleges of the University of Oxford that have undergraduate students in order of the performance of their undergraduate students on that year s final examinations. Contents 1 Overview 2… …