This volume contains the proceedings of the 13th Italian Workshop on
Neural Nets WIRN VIETRI 2002, jointly organized by the International
Institute for Advanced Scienti?c Studies "Eduardo R. Caianiello"
(IIASS), the Societ`aIt- iana Reti Neuroniche (SIREN), the IEEE NNC
Italian RIG, and the Italian SIG of the INNS. In this book a review
talk, dealing with a very up-to-date topic "Ensembles of Learning
Machines", and original contributions, approved by the referee c- mittee
as oral or poster presentations, have been collected. The contributions
have been assembled, for reading convenience, into sections. The last
section, devoted to "Learning in Neural Networks: Limitations and Future
Trends", wasorganizedbyProf.M. Goriandalsocontainstheinvitedl- ture
"Mathematical Modeling of Generalization" given by Dr. Martin Anthony.
The ?rst and second sections are dedicated, respectively, to the memory
of two scientists who were friends in life, Professors Francesco Lauria
and Eduardo R. Caianiello. The editors thank all the participants for
their quali?ed contributions, while special thanks go to Prof. M. Gori
for his help in the organization, and to the referees for their accurate
work. July 2002 MariaMarinaro RobertoTagliaferri
Organizing-Scienti?cCommittee B. Apolloni (Univ. Milano), A. Bertoni
(Univ. Milano), N. A. Borghese (Univ. Milano), D. D. Caviglia (Univ.
Genova), P. Campadelli (Univ. Milano), A. Chella (Univ. Palermo), A.
Colla (ELSAG Genova), A. Esposito (I.I.A.S.S.), C.