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Titlebook: Elements of Finite Model Theory; Leonid Libkin Textbook 2004 Springer-Verlag Berlin Heidelberg 2004 Automat.Variable.automata.complexity.c

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发表于 2025-3-21 18:51:21 | 显示全部楼层 |阅读模式
书目名称Elements of Finite Model Theory
编辑Leonid Libkin
视频video
概述Suitable for both a one-term graduate course, and for self-study, as well as reference.Includes supplementary material:
丛书名称Texts in Theoretical Computer Science. An EATCS Series
图书封面Titlebook: Elements of Finite Model Theory;  Leonid Libkin Textbook 2004 Springer-Verlag Berlin Heidelberg 2004 Automat.Variable.automata.complexity.c
描述Finite model theory is an area of mathematical logic that grew out of computer science applications. The main sources of motivational examples for finite model theory are found in database theory, computational complexity, and formal languages, although in recent years connections with other areas, such as formal methods and verification, and artificial intelligence, have been discovered. The birth of finite model theory is often identified with Trakhtenbrot‘s result from 1950 stating that validity over finite models is not recursively enumerable; in other words, completeness fails over finite models. The tech­ nique of the proof, based on encoding Turing machine computations as finite structures, was reused by Fagin almost a quarter century later to prove his cel­ ebrated result that put the equality sign between the class NP and existential second-order logic, thereby providing a machine-independent characterization of an important complexity class. In 1982, Immerman and Vardi showed that over ordered structures, a fixed point extension of first-order logic captures the complexity class PTIME of polynomial time computable propertiE~s. Shortly thereafter, logical characterizations
出版日期Textbook 2004
关键词Automat; Variable; automata; complexity; complexity theory; formal language; logic; model theory; algorithm
版次1
doihttps://doi.org/10.1007/978-3-662-07003-1
isbn_softcover978-3-642-05948-3
isbn_ebook978-3-662-07003-1Series ISSN 1862-4499 Series E-ISSN 1862-4502
issn_series 1862-4499
copyrightSpringer-Verlag Berlin Heidelberg 2004
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发表于 2025-3-21 21:07:46 | 显示全部楼层
,Ehrenfeucht-Fraïssé Games,ht-Fraïssé games for first-order logic. We prove the EhrenfeuchtFraïssé theorem, characterizing the expressive power of FO via games, and introduce the notion of types, which will be central throughout the book.
发表于 2025-3-22 02:52:21 | 显示全部楼层
Ordered Structures,e ordered; on numbers we have arithmetic operations, on strings we have concatenation, substring tests, and so on. As query languages routinely use those operations, one may want to study them in the context of FO.
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Monadic Second-Order Logic and Automata,esses some NP-complete problems, but at the same time cannot express graph connectivity. Then we restrict our attention to strings and trees, and show that, over them, MSO captures regular string and tree languages. We explore the connection with automata to prove further definability and complexity results.
发表于 2025-3-22 13:18:46 | 显示全部楼层
Zero-One Laws,lso see that the “almost everywhere” behavior of logics is drastically different from their “everywhere” behavior. For example, while satisfiability in the finite is undecidable, it is decidable if a sentence is true in almost all finite models.
发表于 2025-3-22 20:48:09 | 显示全部楼层
Other Applications of Finite Model Theory,of certain logics on some special finite structures (Kripke structures). And finally, it was recently discovered that many constraint satisfaction problems can be reduced to the existence of a homomorphism between two finite structures.
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https://doi.org/10.1007/978-1-349-09087-7re complexity classes. We then study definability and ordering of types in finite variable logics, and use these techniques to relate separating complexity classes to separating sonic fixed point logics over unordered structures.
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