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	lesson 9: the concept of function editor Prof. L. De Menna responsible Prof. N. Fusco – Università di Napoli FEDERICO II - Italy content realization Prof. N. Fusco technical realization Mr. A. de Peppo, Mr. R. De Menna, Dr. F. Pietrafesa, Mr. M. Tomacelli This content has been produced or adapted by Università di Napoli FEDERICO II- NETTUNO technological pole with the European Union financial support within the IST 5th Framework Program GUARDIANS project.