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12. Field Theory and Polynomials

This volume studies fields, polynomials, and algebraic extensions.

This volume studies fields, polynomials, and algebraic extensions. It provides the structural basis for algebraic number theory, algebraic geometry, and Galois theory.

Part I. Fields and Basic Structures

Chapter 1. Fields

1.1 Definition and examples 1.2 Subfields 1.3 Field homomorphisms 1.4 Characteristic of a field 1.5 Prime fields

Chapter 2. Polynomial Rings

2.1 Polynomial definitions 2.2 Arithmetic of polynomials 2.3 Degree and leading coefficient 2.4 Division algorithm 2.5 Euclidean structure

Chapter 3. Factorization

3.1 Irreducible polynomials 3.2 Unique factorization 3.3 Eisenstein criterion 3.4 Factorization over various fields 3.5 Examples

Part II. Field Extensions

Chapter 4. Extensions of Fields

4.1 Definition of extensions 4.2 Degree of extension 4.3 Simple extensions 4.4 Algebraic vs transcendental elements 4.5 Tower law

Chapter 5. Algebraic Extensions

5.1 Minimal polynomials 5.2 Splitting fields 5.3 Algebraic closure 5.4 Construction techniques 5.5 Examples

Chapter 6. Finite Fields

6.1 Existence and uniqueness 6.2 Structure of finite fields 6.3 Polynomial factorization 6.4 Applications 6.5 Computational aspects

Part III. Galois Theory

Chapter 7. Automorphisms

7.1 Field automorphisms 7.2 Fixed fields 7.3 Groups of automorphisms 7.4 Examples 7.5 Structural properties

Chapter 8. Galois Extensions

8.1 Normal and separable extensions 8.2 Definition of Galois extensions 8.3 Fundamental theorem of Galois theory 8.4 Correspondence between subgroups and subfields 8.5 Examples

Chapter 9. Applications of Galois Theory

9.1 Solvability by radicals 9.2 Classical construction problems 9.3 Cyclotomic fields 9.4 Extensions and equations 9.5 Further applications

Part IV. Advanced Polynomial Theory

Chapter 10. Roots and Symmetry

10.1 Symmetric polynomials 10.2 Elementary symmetric functions 10.3 Relations among roots 10.4 Discriminants 10.5 Resultants

Chapter 11. Special Polynomials

11.1 Cyclotomic polynomials 11.2 Chebyshev polynomials 11.3 Orthogonal polynomials (overview) 11.4 Recursive constructions 11.5 Applications

Chapter 12. Factorization Algorithms

12.1 Polynomial factorization methods 12.2 Berlekamp algorithm 12.3 Cantor–Zassenhaus 12.4 Complexity considerations 12.5 Implementation aspects

Part V. Valuation and Local Theory

Chapter 13. Valuations

13.1 Absolute values 13.2 Non-Archimedean valuations 13.3 Completion of fields 13.4 Examples 13.5 Applications

Chapter 14. Local Fields

14.1 Definition and examples 14.2 Extensions of local fields 14.3 Ramification 14.4 Residue fields 14.5 Applications

Chapter 15. Hensel’s Lemma

15.1 Statement and proof 15.2 Lifting solutions 15.3 Applications to polynomials 15.4 p-adic factorization 15.5 Computational use

Part VI. Transcendence and Algebraic Independence

Chapter 16. Transcendental Elements

16.1 Definitions 16.2 Examples 16.3 Algebraic independence 16.4 Extensions generated by transcendental elements 16.5 Applications

Chapter 17. Transcendence Theory (Overview)

17.1 Liouville numbers 17.2 Basic transcendence results 17.3 Measures of transcendence 17.4 Methods 17.5 Examples

Chapter 18. Function Fields

18.1 Definition 18.2 Algebraic curves connection 18.3 Extensions 18.4 Divisors (overview) 18.5 Applications

Part VII. Computational and Applied Aspects

Chapter 19. Computational Field Theory

19.1 Representing fields 19.2 Arithmetic algorithms 19.3 Polynomial arithmetic 19.4 Field extensions in software 19.5 Performance considerations

Chapter 20. Applications in Coding Theory

20.1 Finite fields in coding 20.2 Reed–Solomon codes 20.3 Error detection and correction 20.4 Polynomial interpolation 20.5 Applications

Chapter 21. Applications in Cryptography

21.1 Finite field arithmetic 21.2 Elliptic curve cryptography 21.3 Pairing-based cryptography 21.4 Security assumptions 21.5 Implementation issues

Part VIII. Research Directions

Chapter 22. Advanced Topics

22.1 Inverse Galois problem (overview) 22.2 Infinite extensions 22.3 Field arithmetic 22.4 Model-theoretic aspects 22.5 Emerging areas

Chapter 23. Open Problems

23.1 Classification problems 23.2 Computational complexity 23.3 Structure of extensions 23.4 Connections to geometry 23.5 Future directions

Chapter 24. Historical and Conceptual Notes

24.1 Development of field theory 24.2 Key contributors 24.3 Evolution of ideas 24.4 Cross-disciplinary impact 24.5 Summary

Appendix

A. Common polynomial identities B. Field constructions reference C. Algorithm templates D. Computational tools E. Cross-reference to other MSC branches

This volume builds the theory of fields and polynomials as a central algebraic framework. It connects structural theory with computation and applications.