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14. Algebraic Geometry

This volume studies geometric objects defined by polynomial equations.

This volume studies geometric objects defined by polynomial equations. It connects commutative algebra, geometry, and number theory through the language of varieties and schemes.

Part I. Affine Algebraic Geometry

Chapter 1. Affine Varieties

1.1 Polynomial rings and ideals 1.2 Zero sets of polynomials 1.3 Affine space 1.4 Zariski topology 1.5 Examples

Chapter 2. Coordinate Rings

2.1 Functions on varieties 2.2 Radical ideals 2.3 Nullstellensatz 2.4 Correspondence between ideals and varieties 2.5 Morphisms of varieties

Chapter 3. Algebra–Geometry Correspondence

3.1 Geometric interpretation of algebra 3.2 Irreducibility 3.3 Dimension 3.4 Regular functions 3.5 Examples

Part II. Projective Geometry

Chapter 4. Projective Space

4.1 Homogeneous coordinates 4.2 Projective varieties 4.3 Embeddings 4.4 Hyperplanes 4.5 Examples

Chapter 5. Projective Varieties

5.1 Homogeneous ideals 5.2 Projective Nullstellensatz 5.3 Morphisms 5.4 Rational maps 5.5 Intersection theory basics

Chapter 6. Curves and Surfaces

6.1 Algebraic curves 6.2 Singularities 6.3 Genus (overview) 6.4 Surfaces 6.5 Examples

Part III. Schemes

Chapter 7. Spec of a Ring

7.1 Prime spectrum 7.2 Zariski topology on Spec 7.3 Structure sheaf 7.4 Affine schemes 7.5 Examples

Chapter 8. General Schemes

8.1 Gluing affine schemes 8.2 Morphisms of schemes 8.3 Fiber products 8.4 Base change 8.5 Examples

Chapter 9. Properties of Schemes

9.1 Reduced and irreducible schemes 9.2 Noetherian schemes 9.3 Dimension 9.4 Separated and proper morphisms 9.5 Applications

Part IV. Sheaves and Cohomology

Chapter 10. Sheaves

10.1 Presheaves and sheaves 10.2 Sheaf operations 10.3 Stalks 10.4 Examples 10.5 Applications

Chapter 11. Cohomology

11.1 Derived functors (overview) 11.2 Čech cohomology 11.3 Sheaf cohomology 11.4 Vanishing theorems (overview) 11.5 Applications

Chapter 12. Line Bundles and Divisors

12.1 Cartier and Weil divisors 12.2 Line bundles 12.3 Picard group 12.4 Linear systems 12.5 Applications

Part V. Advanced Topics

Chapter 13. Intersection Theory

13.1 Intersection multiplicities 13.2 Chow groups (overview) 13.3 Basic constructions 13.4 Applications 13.5 Examples

Chapter 14. Singularities

14.1 Types of singularities 14.2 Resolution of singularities (overview) 14.3 Normalization 14.4 Local properties 14.5 Applications

Chapter 15. Moduli Spaces

15.1 Parameter spaces 15.2 Families of varieties 15.3 Representability 15.4 Examples 15.5 Applications

Part VI. Arithmetic and Geometric Connections

Chapter 16. Varieties over Fields

16.1 Varieties over finite fields 16.2 Rational points 16.3 Zeta functions (overview) 16.4 Applications 16.5 Examples

Chapter 17. Arithmetic Geometry

17.1 Schemes over integers 17.2 Diophantine geometry 17.3 Elliptic curves 17.4 Heights (overview) 17.5 Applications

Chapter 18. Complex Algebraic Geometry

18.1 Varieties over complex numbers 18.2 Analytic spaces 18.3 Hodge theory (overview) 18.4 Topological invariants 18.5 Applications

Part VII. Computational and Applied Aspects

Chapter 19. Computational Algebraic Geometry

19.1 Gröbner bases revisited 19.2 Elimination theory 19.3 Solving polynomial systems 19.4 Complexity issues 19.5 Software tools

Chapter 20. Applications

20.1 Coding theory 20.2 Cryptography 20.3 Robotics and kinematics 20.4 Computer vision 20.5 Data science

Chapter 21. Tropical Geometry (Overview)

21.1 Tropical semiring 21.2 Tropical varieties 21.3 Combinatorial structures 21.4 Applications 21.5 Connections

Part VIII. Research Directions

Chapter 22. Advanced Topics

22.1 Derived algebraic geometry (overview) 22.2 Stacks (overview) 22.3 Mirror symmetry (overview) 22.4 Noncommutative geometry (overview) 22.5 Emerging areas

Chapter 23. Open Problems

23.1 Classification of varieties 23.2 Singularities and resolution 23.3 Moduli questions 23.4 Computational challenges 23.5 Future directions

Chapter 24. Historical and Conceptual Notes

24.1 Development of algebraic geometry 24.2 Key contributors 24.3 Evolution from classical to modern 24.4 Cross-disciplinary impact 24.5 Summary

Appendix

A. Standard constructions reference B. Key theorems summary C. Proof templates D. Computational tools E. Cross-reference to other MSC branches

This volume builds algebraic geometry from classical varieties to modern scheme theory. It emphasizes the algebra–geometry correspondence and the structural role of commutative algebra.