p -adic Differential Equations
, by Kiran S. KedlayaNote: Supplemental materials are not guaranteed with Rental or Used book purchases.
- ISBN: 9780521768795 | 0521768799
- Cover: Hardcover
- Copyright: 7/26/2010
Over the last 50 years the theory of p-adic differential equations has grown into an active area of research in its own right, and has important applications to number theory and to computer science. This book, the first comprehensive and unified introduction to the subject, improves and simplifies existing results as well as including original material. Based on a course given by the author at MIT, this modern treatment is accessible to graduate students and researchers. Exercises are included at the end of each chapter to help the reader review the material, and the author also provides detailed references to the literature to aid further study.
Preface | p. xiii |
Introductory remarks | p. 1 |
Why p-adic differential equations? | p. 1 |
Zeta functions of varieties | p. 3 |
Zeta functions and p-adic differential equations | p. 5 |
A word of caution | p. 7 |
Notes | p. 8 |
Exercises | p. 9 |
Tools of p-adic Analysis | p. 11 |
Norms on algebraic structures | p. 13 |
Norms on abelian groups | p. 13 |
Valuations and nonarchimedean norms | p. 16 |
Norms on modules | p. 17 |
Examples of nonarchimedean norms | p. 25 |
Spherical completeness | p. 28 |
Notes | p. 31 |
Exercises | p. 33 |
Newton polygons | p. 35 |
Introduction to Newton polygons | p. 35 |
Slope factorizations and a master factorization theorem | p. 38 |
Applications to nonarchimedean field theory | p. 41 |
Notes | p. 42 |
Exercises | p. 43 |
Ramification theory | p. 45 |
Defect | p. 46 |
Unramified extensions | p. 47 |
Tamely ramified extensions | p. 49 |
The case of local fields | p. 52 |
Notes | p. 53 |
Exercises | p. 54 |
Matrix analysis | p. 55 |
Singular values and eigenvalues (archimedean case) | p. 56 |
Perturbations (archimedean case) | p. 60 |
Singular values and eigenvalues (nonarchimedean case) | p. 62 |
Perturbations (nonarchimedean case) | p. 68 |
Horn's inequalities | p. 71 |
Notes | p. 72 |
Exercises | p. 74 |
Differential Algebra | p. 75 |
Formalism of differential algebra | p. 77 |
Differential rings and differential modules | p. 77 |
Differential modules and differential systems | p. 80 |
Operations on differential modules | p. 81 |
Cyclic vectors | p. 84 |
Differential polynomials | p. 85 |
Differential equations | p. 87 |
Cyclic vectors: a mixed blessing | p. 87 |
Taylor series | p. 90 |
Notes | p. 91 |
Exercises | p. 91 |
Metric properties of differential modules | p. 93 |
Spectral radii of bounded endomorphisms | p. 93 |
Spectral radii of differential operators | p. 95 |
A coordinate-free approach | p. 102 |
Newton polygons for twisted polynomials | p. 104 |
Twisied polynomials and spectral radii | p. 105 |
The visible decomposition theorem | p. 107 |
Matrices and the visible spectrum | p. 109 |
A refined visible decomposition theorem | p. 112 |
Changing the constant field | p. 114 |
Notes | p. 116 |
Exercises | p. 117 |
Regular singularities | p. 118 |
Irregularity | p. 119 |
Exponents in the complex analytic setting | p. 120 |
Formal solutions of regular differential equations | p. 123 |
Index and irregularity | p. 126 |
The Turrittin-Levelt-Hukuhara decomposition theorem | p. 127 |
Notes | p. 129 |
Exercises | p. 130 |
p-adic Differential Equations on Discs and Annuli | p. 133 |
Rings of functions on discs and annuli | p. 135 |
Power series on closed discs and annuli | p. 136 |
Gauss norms and Newton polygons | p. 138 |
Factorization results | p. 140 |
Open discs and annuli | p. 143 |
Analytic elements | p. 144 |
More approximation arguments | p. 147 |
Notes | p. 149 |
Exercises | p. 150 |
Radius and generic radius of convergence | p. 151 |
Differential modules have no torsion | p. 152 |
Antidifferentiation | p. 153 |
Radius of convergence on a disc | p. 154 |
Generic radius of convergence | p. 155 |
Some examples in rank 1 | p. 157 |
Transfer theorems | p. 158 |
Geometric interpretation | p. 160 |
Subsidiary radii | p. 162 |
Another example in rank 1 | p. 162 |
Comparison with the coordinate-free definition | p. 164 |
Note | p. 165 |
Exercises | p. 166 |
Frobenius pullback and pushforward | p. 168 |
Why Frobenius descent? | p. 168 |
pth powers and roots | p. 169 |
Frobenius pullback and pushforward operations | p. 170 |
Frobenius antecedents | p. 172 |
Frobenius descendants and subsidiary radii | p. 174 |
Decomposition by spectral radius | p. 176 |
Integrality of the generic radius | p. 180 |
Off-center Frobenius antecedents and descendants | p. 181 |
Notes | p. 182 |
Exercises | p. 183 |
Variation of generic and subsidiary radii | p. 184 |
Harmonicity of the valuation function | p. 185 |
Variation of Newton polygons | p. 186 |
Variation of subsidiary radii: statements | p. 189 |
Convexity for the generic radius | p. 190 |
Measuring small radii | p. 191 |
Larger radii | p. 193 |
Monotonicity | p. 195 |
Radius versus generic radius | p. 197 |
Subsidiary radii as radii of optimal convergence | p. 198 |
Notes | p. 199 |
Exercises | p. 200 |
Decomposition by subsidiary radii | p. 201 |
Metrical detection of units | p. 202 |
Decomposition over a closed disc | p. 203 |
Decomposition over a closed annulus | p. 207 |
Decomposition over an open disc or annulus | p. 209 |
Partial decomposition over a closed disc or annulus | p. 210 |
Modules solvable at a boundary | p. 211 |
Solvable modules of rank 1 | p. 212 |
Clean modules | p. 214 |
Notes | p. 216 |
Exercises | p. 216 |
p-adic exponents | p. 218 |
p-adic Liouville numbers | p. 218 |
p-adic regular singularities | p. 221 |
The Robba condition | p. 222 |
Abstract p-adic exponents | p. 223 |
Exponents for annuli | p. 225 |
The p-adic Fuchs theorem for annuli | p. 231 |
Transfer to a regular singularity | p. 234 |
Notes | p. 237 |
Exercises | p. 238 |
Difference Algebra and Frobenius Modules | p. 241 |
Formalism of difference algebra | p. 243 |
Difference algebra | p. 243 |
Twisted polynomials | p. 246 |
Difference-closed fields | p. 247 |
Difference algebra over a complete field | p. 248 |
Hodge and Newton polygons | p. 254 |
The Dieudonné-Manin classification theorem | p. 256 |
Notes | p. 258 |
Exercises | p. 260 |
Frobenius modules | p. 262 |
A multitude of rings | p. 262 |
Frobenius lifts | p. 264 |
Generic versus special Frobenius lifts | p. 266 |
A reverse filtration | p. 269 |
Notes | p. 271 |
Exercises | p. 272 |
Frobenius modules over the Robba ring | p. 273 |
Frobenius modules on open discs | p. 273 |
More on the Robba ring | p. 275 |
Pure difference modules | p. 277 |
The slope filtration theorem | p. 279 |
Proof of the slope filtration theorem | p. 281 |
Notes | p. 284 |
Exercises | p. 286 |
Frobenius Structures | p. 289 |
Frobenius structures on differential modules | p. 291 |
Frobenius structures | p. 291 |
Frobenius structures and the generic radius of convergence | p. 294 |
Independence from the Frobenius lift | p. 296 |
Slope filtrations and differential structures | p. 298 |
Extension of Frobenius structures | p. 298 |
Notes | p. 299 |
Exercises | p. 300 |
Effective convergence bounds | p. 301 |
A first bound | p. 301 |
Effective bounds for solvable modules | p. 302 |
Better bounds using Frobenius structures | p. 306 |
Logarithmic growth | p. 308 |
Nonzero exponents | p. 310 |
Notes | p. 310 |
Exercises | p. 311 |
Galois representations and differential modules | p. 313 |
Representation and differential modules | p. 314 |
Finite representations and overconvergent differential modules | p. 316 |
The unit-root p-adic local monodromy theorem | p. 318 |
Ramification and differential slopes | p. 321 |
Notes | p. 323 |
Exercises | p. 325 |
The p-adic local monodromy theorem | p. 326 |
Statement of the theorem | p. 326 |
An example | p. 328 |
Descent of sections | p. 329 |
Local duality | p. 332 |
When the residue field is imperfect | p. 333 |
Notes | p. 335 |
Exercises | p. 337 |
The p-adic local monodromy theorem: proof | p. 338 |
Running hypotheses | p. 338 |
Modules of differential slope 0 | p. 339 |
Modules of rank 1 | p. 341 |
Modules of rank prime to p | p. 342 |
The general case | p. 343 |
Notes | p. 343 |
Exercises | p. 344 |
Areas of Application | p. 345 |
Picard-Fuchs modules | p. 347 |
Origin of Picard-Fuchs modules | p. 347 |
Frobenius structures on Picard-Fuchs modules | p. 348 |
Relationship to zeta functions | p. 349 |
Notes | p. 350 |
Rigid cohomology | p. 352 |
Isocrystals on the affine line | p. 352 |
Crystalline and rigid cohomology | p. 353 |
Machine computations | p. 354 |
Notes | p. 355 |
p-adic Hodge theory | p. 357 |
A few rings | p. 357 |
(¿, ¿)-modules | p. 359 |
Galois cohomology | p. 361 |
Differential equations from (¿, ¿)-modules | p. 362 |
Beyond Galois representations | p. 363 |
Notes | p. 364 |
References | p. 365 |
Notation | p. 374 |
Index | p. 376 |
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