• Regularity and asymptotic properties of semigroups
• Perturbation theory and abstract Volterra operator
• Delay and functional differential equations
• Age-dependent population equations

• pdf-file
  

• R. Nagel, S. Piazzera: On the regularity properties of perturbed semigroups,   Rend. Circ. Matem. Palermo Serie II, Suppl. 56 (1998), 99-110.
• A. Bátkai, S. Piazzera: Semigroups and linear partial differential equations with delay, J. Math. Anal. Appl.., 264 (2001), 1-20.
• A. Bátkai, S. Piazzera: Damped wave equations with delay,  "Topics in Functional Differential and Difference Equations", Fields Institute Communications, Vol. 29, 2001, 51-61.
• A. Bátkai, S. Piazzera: A semigroup method for delay equations with relatively bounded operators in the delay term,, Semigroup Forum 64 (2002), 71-89.
• V. Casarino, S. Piazzera: On the stability of asymptotic properties of  perturbed C₀-semigroups, Forum Math. 13 (2001), 91-107.
• V. Casarino, L. Maniar and S. Piazzera: The asymptotic behaviour of perturbed evolution families, Diff. Int. Equations 15 (2002), 567-586.
• S. Piazzera: An age dependent population equation with delayed birth process, Math. Methods Appl. Sci. 27 (2004), 427-439.
• V. Casarino, K.-J. Engel, G. Nickel, and S. Piazzera: Decoupling techniques for wave equations with dynamic boundary conditions, Discrete Cont. Dyn. Syst. 12 (2005), 761-772.
  
• S. Piazzera, L. Tonetto: Asyncronous exponential growth for an age dependent population equation with delayed birth process, J. Evol. Equ. 5 (2005), 61-77.
• A. Bátkai, S. Piazzera: Semigroups for Delay Equations. In S. Romanelli, R.M. Mininni and S. Lucente (eds), MINICOURSE-WORKSHOP, Interplay between C₀-semigroups and PDEs: theory and applications. September 22-26, 2003, Bari, Italy.

• CIRM Autumn School on Evolution Equations and Semigroups, October 28-November 2, 2001, Levico Terme (Italy).
• TULKA Confernce on Semigroups and Evolution Equations, June 13-17, 2001, Blaubeuren (Germany).
• International Minicourse-Workshop "Interplay between C₀-semigroups and PDEs theory and applications", September 22-26, 2003, Bari, Italy.
• 1^st Dynamical Networks Days, October 8-10, 2004, Centro Congressi Panorama, Trento, Italy.

Tennis, softball, bridge, ski (photo1, photo2) and trekking on "my" mountains