Preface . . ix Chapter 1. Hyperplane sections of lp-balls . . 1 Chapter 2. Volume and the Fourier transform . . 9 Chapter 3. Intersection bodies . . 21 Chapter 4. The Busemann-Petty problem . . 39 Chapter 5. Projections and the Fourier transform . . 59 Chapter 6. Intersection bodies and Lp-spaces . . 67 Chapter 7. On the road between polar projection bodies and intersection bodies . . 75 Chapter 8. Open problems . . 87 Bibliography . . 101 Index . . 107