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| | 13: Commutative rings and algebras |
 | | Of particular interest are several classes of rings of interest in number theory, field theory, algebraic geometry, and related areas; however, other classes of rings arise, and a rich structure theory arises to analyze commutative rings in general, using the concepts of ideals, localizations, and homological algebra. |
 | | Typically one classifies problems as Algebraic Geometry when stated in terms of points, hypersurfaces, divisors, and other geometric objects, and as Commutative Algebra when stated in terms of ideals and coordinate rings, although in practice techniques from both areas are used in tandem. |
 | | The algebraic study of general collections of polynomials is appropriate for this field; the study of individual polynomials or specific collections usually belongs elsewhere. |
| www.math.niu.edu /~rusin/known-math/index/13-XX.html (2760 words) |
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