1. Riemannian Extensions and Curvature Operators Esteban Calviño Louzao Joint work with M. E. Vázquez Abal and R. Vázquez Lorenzo

3. Curvature Operators

4. Four-dimensional Osserman Metrics

5. Four-dimensional Walker Metrics

6. A special class of Walker metrics

8. Nilpotent Osserman Metrics

9. Type II Non-Nilpotent Osserman Metrics

10. Ivanov-Petrova metrics

11. Locally Homogeneous Affine Surfaces

14. Riemannian Extensions and Curvature Operators Esteban Calviño Louzao Joint work with M. E. Vázquez Abal and R. Vázquez Lorenzo