| Preface | 5 |
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| Contents | 6 |
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| Introduction | 13 |
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| Part I Basic Hodge Theory | 21 |
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| 1 Compact K ahler Manifolds | 22 |
| 1.1 Classical Hodge Theory | 22 |
| 1.2 The Lefschetz Decomposition | 31 |
| 1.3 Applications | 39 |
| 2 Pure Hodge Structures | 44 |
| 2.1 Hodge Structures | 44 |
| 2.2 Mumford-Tate Groups of Hodge Structures | 51 |
| 2.3 Hodge Filtration and Hodge Complexes | 54 |
| 2.4 Re ned Fundamental Classes | 62 |
| 2.5 Almost K ahler V -Manifolds | 67 |
| 3 Abstract Aspects of Mixed Hodge Structures | 72 |
| 3.1 Introduction to Mixed Hodge Structures: Formal Aspects | 73 |
| 3.2 Comparison of Filtrations | 77 |
| 3.3 Mixed Hodge Structures and Mixed Hodge Complexes | 80 |
| 3.4 The Mixed Cone | 87 |
| 3.5 Extensions of Mixed Hodge Structures | 90 |
| Part II Mixed Hodge structures on Cohomology Groups | 97 |
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| 4 Smooth Varieties | 98 |
| 4.1 Main Result | 98 |
| 4.2 Residue Maps | 101 |
| 4.3 Associated Mixed Hodge Complexes of Sheaves | 105 |
| 4.4 Logarithmic Structures | 108 |
| 4.5 Independence of the Compacti cation and Further Complements | 110 |
| 5 Singular Varieties | 118 |
| 5.1 Simplicial and Cubical Sets | 118 |
| 5.2 Construction of Cubical Hyperresolutions | 128 |
| 5.3 Mixed Hodge Theory for Singular Varieties | 133 |
| 5.4 Cup Product and the K unneth Formula. | 142 |
| 5.5 Relative Cohomology | 144 |
| 6 Singular Varieties: Complementary Results | 149 |
| 6.1 The Leray Filtration | 149 |
| 6.2 Deleted Neighbourhoods of Algebraic Sets | 152 |
| 6.3 Cup and Cap Products, and Duality | 160 |
| 7 Applications to Algebraic Cycles and to Singularities | 168 |
| 7.1 The Hodge Conjectures | 168 |
| 7.2 Deligne Cohomology | 175 |
| 7.3 The Filtered De Rham Complex And Applications | 180 |
| Part III Mixed Hodge Structures on Homotopy Groups | 195 |
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| 8 Hodge Theory and Iterated Integrals | 196 |
| 8.1 Some Basic Results from Homotopy Theory | 197 |
| 8.2 Formulation of the Main Results | 201 |
| 8.3 Loop Space Cohomology and the Homotopy De Rham Theorem | 204 |
| 8.4 The Homotopy De Rham Theorem for the Fundamental Group | 210 |
| 8.5 Mixed Hodge Structure on the Fundamental Group | 213 |
| 8.6 The Sullivan Construction | 216 |
| 8.7 Mixed Hodge Structures on the Higher Homotopy Groups | 218 |
| 9 Hodge Theory and Minimal Models | 223 |
| 9.1 Minimal Models of Di erential Graded Algebras | 224 |
| 9.2 Postnikov Towers and Minimal Models | the Simply Connected Case |
| 9.3 Mixed Hodge Structures on the Minimal Model | 228 |
| 9.4 Formality of Compact K ahler Manifolds | 234 |
| Part IV Hodge Structures and Local Systems | 241 |
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| 10 Variations of Hodge Structure | 242 |
| 10.1 Preliminaries: Local Systems over Complex Manifolds | 242 |
| 10.2 Abstract Variations of Hodge Structure | 244 |
| 10.3 Big Monodromy Groups, an Application | 248 |
| 10.4 Variations of Hodge Structures Coming From Smooth Families | 251 |
| 11 Degenerations of Hodge Structures | 256 |
| 11.1 Local Systems Acquiring Singularities | 256 |
| 11.2 The Limit Mixed Hodge Structure on Nearby Cycle Spaces | 262 |
| 11.3 Geometric Consequences for Degenerations | 277 |
| 11.4 Examples | 288 |
| 12 Applications of Asymptotic Hodge theory | 291 |
| 12.1 Applications to Singularities | 291 |
| 12.2 An Application to Cycles: Grothendieck's Induction Principle | 297 |
| 13 Perverse Sheaves and D-Modules | 302 |
| 13.1 Verdier Duality | 302 |
| 13.2 Perverse Complexes | 307 |
| 13.3 Introduction to D-Modules | 314 |
| 13.4 Coherent D-Modules | 321 |
| 13.5 Filtered D-modules | 328 |
| 13.6 Holonomic D-Modules | 330 |
| 14 Mixed Hodge Modules | 338 |
| 14.1 An Axiomatic Introduction | 339 |
| 14.2 The Kashiwara-Malgrange Filtration | 348 |
| 14.3 Polarizable Hodge Modules | 354 |
| 14.4 Mixed Hodge Modules | 363 |
| Part V Appendices | 373 |
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| A Homological Algebra | 374 |
| A.1 Additive and Abelian Categories | 374 |
| A.2 Derived Categories | 379 |
| A.3 Spectral Sequences and Filtrations | 393 |
| B Algebraic and Di erential Topology | 403 |
| B.1 Singular (Co)homology and Borel-Moore Homology | 403 |
| B.2 Sheaf Cohomology | 408 |
| B.3 Local Systems and Their Cohomology | 425 |
| C Strati ed Spaces and Singularities | 431 |
| C.1 Strati ed Spaces | 431 |
| C.2 Fibrations, and the Topology of Singularities | 435 |
| References | 443 |
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| Index of Notations | 455 |
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| Index | 458 |