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In spite of some recent applications of ultraproducts in algebra, they remain largely unknown to commutative algebraists, in part because they do not preserve basic properties such as Noetherianity. This work wants to make a strong case against these prejudices. More precisely, it studies ultraproducts of Noetherian local rings from a purely algebraic perspective, as well as how they can be used to transfer results between the positive and zero characteristics, to derive uniform bounds, to define tight closure in characteristic zero, and to prove asymptotic versions of homological conjectures in mixed characteristic. Some of these results are obtained using variants called chromatic products, which are often even Noetherian. This book, neither assuming nor using any logical formalism, is intended for algebraists and geometers, in the hope of popularizing ultraproducts and their applications in algebra.
Commutative algebra --- Ultraproducts --- Mathematics --- Physical Sciences & Mathematics --- Algebra --- Mathematical Theory --- Commutative algebra. --- Ultraproducts. --- Prime products --- Products, Prime --- Products, Ultra --- -Ultra-products --- Mathematics. --- Algebraic geometry. --- Commutative rings. --- Commutative Rings and Algebras. --- Algebraic Geometry. --- Rings (Algebra) --- Algebraic geometry --- Geometry --- Math --- Science --- Model theory --- Algebra. --- Geometry, algebraic. --- Mathematical analysis
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Henkin-Keisler models emanate from a modification of the Henkin construction introduced by Keisler to motivate the definition of ultraproducts. Keisler modified the Henkin construction at that point at which `new' individual constants are introduced and did so in a way that illuminates a connection between Henkin-Keisler models and ultraproducts. The resulting construction can be viewed both as a specialization of the Henkin construction and as an alternative to the ultraproduct construction. These aspects of the Henkin-Keisler construction are utilized here to present a perspective on ultraproducts and their applications accessible to the reader familiar with Henkin's proof of the completeness of first order logic and naive set theory. This approach culminates in proofs of various forms of the Keisler-Shelah characterizations of elementary equivalence and elementary classes via Henkin-Keisler models. The presentation is self-contained and proofs of more advanced results from set theory are introduced as needed. Audience: Logicians in philosophy, computer science, linguistics and mathematics.
Ultraproducts --- First-order logic --- Mathematics. --- Logic. --- Computer science. --- Mathematical logic. --- Mathematical Logic and Foundations. --- Computer Science, general. --- Logic, Symbolic and mathematical. --- Model theory --- Prime products --- Products, Prime --- Products, Ultra --- -Ultra-products --- Logic, Symbolic and mathematical --- Logic, Modern --- Informatics --- Science --- Argumentation --- Deduction (Logic) --- Deductive logic --- Dialectic (Logic) --- Logic, Deductive --- Intellect --- Philosophy --- Psychology --- Reasoning --- Thought and thinking --- Algebra of logic --- Logic, Universal --- Mathematical logic --- Symbolic and mathematical logic --- Symbolic logic --- Mathematics --- Algebra, Abstract --- Metamathematics --- Set theory --- Syllogism --- Methodology --- Model theory. --- First-order logic.
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