# classifying

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**Projective unitary group**— In mathematics, the projective unitary group PU( n ) is the quotient of the unitary group U( n ) by the right multiplication of its center, U(1), embedded as scalars.Abstractly, it is the isometry group of complex projective space, just as the… …22

**religions, classification of**— Introduction the attempt to systematize and bring order to a vast range of knowledge about religious beliefs, practices, and institutions. It has been the goal of students of religion for many centuries but especially so with the increased… …23

**Charles Martel (librarian)**— This article is about American librarian. For other uses, see Charles Martel (disambiguation). Charles Martel (born Karl David Hanke,[1] March 5, 1860, in Zurich, Switzerland May 15, 1945) was an American librarian responsible for the creation of …24

**Decision-theoretic rough sets**— (DTRS) is a probabilistic extension of rough set classification. First created in 1990 by Dr. Yiyu Yao[1], the extension makes use of loss functions to derive and region parameters. Like rough sets, the lower and upper approximations of a set are …25

**Jonathan M. Rothberg**— Dieser Artikel wurde aufgrund von Mängeln auf der Qualitätssicherungsseite der Redaktion Chemie eingetragen. Dies geschieht, um die Qualität der Artikel aus dem Themengebiet Chemie auf ein akzeptables Niveau zu bringen. Dabei können Artikel… …26

**Paleontology**— Palaeontology redirects here. For the scientific journal, see Palaeontology (journal). Paleontology studies the entire history of life on Earth. Paleontology (pronounced /ˌpælɪɒnˈtɒlədʒi/; British: palaeontology; from Greek: παλαιός… …27

**Complex projective space**— The Riemann sphere, the one dimensional complex projective space, i.e. the complex projective line. In mathematics, complex projective space is the projective space with respect to the field of complex numbers. By analogy, whereas the points of a …28

**Bott periodicity theorem**— In mathematics, the Bott periodicity theorem is a result from homotopy theory discovered by Raoul Bott during the latter part of the 1950s, which proved to be of foundational significance for much further research, in particular in K theory of… …29

**Segal conjecture**— Segal s Burnside ring conjecture, or, more briefly, the Segal conjecture, is a theorem in homotopy theory, a branch of mathematics. The theorem relates the Burnside ring of a finite group G to the stable cohomotopy of the classifying space BG .… …30

**race**— race1 /rays/, n., v., raced, racing. n. 1. a contest of speed, as in running, riding, driving, or sailing. 2. races, a series of races, usually of horses or dogs, run at a set time over a regular course: They spent a day at the races. 3. any… …