Note Di Matematica
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2013 volume 33 numero 1 NOTE DI MATEMATICA PUBBLICAZIONE SEMESTRALE Advances in Group Theory and Applications 2011 Volume 33, anno 2013, n◦ 1 Editorial ISSN 1123–2536 (printed version) ISSN 1590–0932 (electronic version) Questa opera `eprotetta dalla Legge sul diritto d’autore (Legge n. 633/1941: http://www. giustizia.it/cassazione/leggi/1633_41.html). Tutti i diritti, in particolare quelli relativi alla traduzione, alla citazione, alla riproduzione in qualsiasi forma, all’uso delle illustrazioni, delle tabelle e del materiale software a corredo, alla trasmissione radiofonica o televisiva, alla registrazione analogica o digitale, alla pubblicazione e diffusione attraverso la rete Internet sono riservati, anche nel caso di utilizzo parziale. La Rivista “Note di Matematica” esce in fascicoli semestrali. This volume contains the proceedings of the international conference “Ad- Direttore Responsabile: Silvia Cazzato vances in Group Theory and Applications 2011”, held in Porto Cesareo in Editor-in-Chief : D. Perrone, Dipartimento di Matematica “Ennio De Giorgi”, Universit`adel June 2011. This was the third in a series of such conferences. The detailed Salento, Via per Arnesano, 73100 LECCE (Italy) course notes and individual research papers, which the authors have so gener- Secretaries: A. Albanese, Dipartimento di Matematica “Ennio De Giorgi”, Universit`adel Salento, Via per Arnesano, 73100 LECCE (Italy); F. Catino, Dipartimento di Matematica ously and carefully edited, provide a background and stimulus that will promote “Ennio De Giorgi”, Universit`adel Salento, Via per Arnesano, 73100 LECCE (Italy). further efforts to resolve the many challenging questions raised. Editorial board: M. Biliotti, Dipartimento di Matematica “E. De Giorgi”, Universit`adel Salento In this regard, prompted by the success of the earlier volumes, the Scientific Via per Arnesano, 73100 LECCE (Italy); B. C. Berndt, Department of Mathematics, Univer- Committee decided to continue the conference format – “Lecture courses” com- sity of Illinois at Urbana-Champaign, 1409 West Green Street Urbana, ILLINOIS 61801-2975 plemented by individual “Research presentations”. We express our sincerest (U.S.A.); D. E. Blair, Michigan State University, Department of Mathematics Via per Arne- sano, 73100 LECCE (Italy); C. Ciliberto, Dipartimento di Matematica, Universit`adi Roma thanks to all who attended the conference and trust that these proceedings will Tor Vergata, Via della Ricerca Scientifica, 00133 ROMA (Italy); F. De Giovanni, Dipartimento serve also as a special memento of an enjoyable meeting. di Matematica e Applicazioni, Universit`adi Napoli “Federico II”, Via Cintia 80126 NAPOLI Without special financial support it would not be possible to undertake (Italy); N. Fusco, Dipartimento di Matematica e Applicazioni, Universit`adi Napoli “Federico the many organizational tasks. We gratefully acknowledge the contribution II”, Via Cintia 80126 NAPOLI (Italy); N. Johnson, Mathematics Department Univ. Iowa, Iowa City, IOWA 52242 (U.S.A.); O. Kowalski, MFF U.K. Sokolovsk´a83, 18600 PRAHA (Czech made by “Universit`adel Salento”, “Universit`adi Napoli Federico II”, “Seconda Republic); H. Laue, Mathem. Seminar der Universit¨at Kiel, Ludewig Meyn Str. 4, D-24118 Universit`adi Napoli”, “Universit`adi Salerno”, “Universit`adell’Aquila” and KIEL 1 (Germany); G. Metafune, Dipartimento di Matematica “E. De Giorgi”, Universit`a G.N.S.A.G.A. of INdAM. del Salento, Via per Arnesano, 73100 LECCE (Italy); J. J. Quesada Molina, Departamento We give special mention to Valerio Guido, Maria Maddalena Miccoli, Roberto de Matem´atica Aplicada, Universidad de Granada, 18071 GRANADA (Spain); A. Rhandi, Dipartimento di Ingegneria dell’Informazione e Mat. Appl., Universit`adi Salerno, Via Ponte Rizzo, Alessio Russo, Salvatore Siciliano, Ernesto Spinelli, Giovanni Vincenzi. Don Melillo 1, 84084 Fisciano (Sa), (Italy); K. Strambach, Mathematisches Institut, Univ. Their expert knowledge and willing assistance ensured that any administra- Erlangen, N¨urnberg, Bismarckstrasse 1, D-8520 ERLANGEN (Germany). tive help sought was delivered speedily and with caring courtesy. We are most Autorizzazione del Tribunale di Lecce n. 273 del 6 aprile 1981 grateful to them and also acknowledge with pleasure their valued contribution. ©2013 Universita´ del Salento Tutti i diritti sono riservati Francesco Catino, Francesco de Giovanni, Martin L. Newell, Carlo M. Scoppola La carta utilizzata per la stampa di questo volume `einalterabile, priva di acidi, a pH neutro, conforme alle norme UNI EN Iso 9706 , realizzata con materie prime fibrose vergini prove- ∞ nienti da piantagioni rinnovabili e prodotti ausiliari assolutamente naturali, non inquinanti e totalmente biodegradabili. Editorial This volume contains the proceedings of the international conference “Ad- vances in Group Theory and Applications 2011”, held in Porto Cesareo in June 2011. This was the third in a series of such conferences. The detailed course notes and individual research papers, which the authors have so gener- ously and carefully edited, provide a background and stimulus that will promote further efforts to resolve the many challenging questions raised. In this regard, prompted by the success of the earlier volumes, the Scientific Committee decided to continue the conference format – “Lecture courses” com- plemented by individual “Research presentations”. We express our sincerest thanks to all who attended the conference and trust that these proceedings will serve also as a special memento of an enjoyable meeting. Without special financial support it would not be possible to undertake the many organizational tasks. We gratefully acknowledge the contribution made by “Universit`adel Salento”, “Universit`adi Napoli Federico II”, “Seconda Universit`adi Napoli”, “Universit`adi Salerno”, “Universit`adell’Aquila” and G.N.S.A.G.A. of INdAM. We give special mention to Valerio Guido, Maria Maddalena Miccoli, Roberto Rizzo, Alessio Russo, Salvatore Siciliano, Ernesto Spinelli, Giovanni Vincenzi. Their expert knowledge and willing assistance ensured that any administra- tive help sought was delivered speedily and with caring courtesy. We are most grateful to them and also acknowledge with pleasure their valued contribution. Francesco Catino, Francesco de Giovanni, Martin L. Newell, Carlo M. Scoppola Participants Christos A. PALLIKAROS (Nicosia, Cyprus) Liviana PALMISANO (Padova, Italy) Bernhard AMBERG (Mainz, Germany) Eduardo PASCALI (Lecce, Italy) Antonio AULETTA (Napoli, Italy) Alberto PASSUELLO (Padova, Italy) Adolfo BALLESTER-BOLINCHES (Valencia, Spain) Elisabetta PASTORI (Torino, Italy) Andrea CARANTI (Trento, Italy) Jacopo PELLEGRINI (Padova, Italy) Francesco CATINO (Lecce, Italy) Elisa PERRONE (Lecce, Italy) Ilaria COLAZZO (Lecce, Italy) Raffaele RAINONE (Padova, Italy) Ulderico DARDANO (Napoli, Italy) David RILEY (Western Ontario, Canada) Rex DARK (Galway, Ireland) Silvana RINAURO (Potenza, Italy) Maria DE FALCO (Napoli, Italy) Roberto RIZZO (Lecce, Italy) Costantino DELIZIA (Salerno, Italy) Derek J. S. ROBINSON (Urbana, USA) Eloisa DETOMI (Padova, Italy) Emanuela ROMANO (Salerno, Italy) Dikran Dikranjan (Udine, Italy) Alessio RUSSO (Caserta, Italy) Duong Hoang DUNG (Padova, Italy) Laura RUZITTU (Lecce, Italy) Ramon ESTEBAN-ROMERO (Valencia, Spain) Carlo M. SCOPPOLA (L’Aquila, Italy) Arnold FELDMANN (Lancaster, USA) Sudarshan K. SEHGAL (Alberta, Canada) Rolf FARNSTEINER (Kiel, Germany) Luigi SERENA (Firenze, Italy) Martino GARONZI (Padova, Italy) Mohammadhossein SHAHZAMANIANCICHANI (Brussel, Belgium) Norberto GAVIOLI (L’Aquila, Italy) Salvatore SICILIANO (Lecce, Italy) Francesco DE GIOVANNI (Napoli, Italy) Ernesto SPINELLI (Lecce, Italy) Willem DE GRAAF (Trento, Italy) Paola STEFANELLI (Lecce, Italy) Valerio GUIDO (Lecce, Italy) Alexey STEPANOV (St. Petersburg, Russia) Diana IMPERATORE (Napoli, Italy) Yaroslav P. SYSAK (Kiev, Ukraine) Nataliya IVANOVA (Kiev, Ukraine) Antonio TORTORA (Salerno, Italy) Eric JESPERS (Brussel, Belgium) Maria TOTA (Salerno, Italy) Behrooz KHOSRAVI (Tehran, Iran) Nadir TRABELSI (Setif, Algeria) Dariush KIANI (Teheran, Iran) Nikolai VAVILOV (St. Petersburg, Russia) Benjamin KLOPSCH (London, UK) Giovanni VINCENZI (Salerno, Italy) Gregory LEE (Thunder Bay, Canada) Thomas WEIGEL (Milano, Italy) Patrizia LONGOBARDI (Salerno, Italy) Mercede MAJ (Salerno, Italy) Dmitri MALININ (Johor Bahru, Malaysia) Maria MARTUSCIELLO (Napoli, Italy) Maurizio MERIANO (Salerno, Italy) Maria Maddalena MICCOLI (Lecce, Italy) Marta MORIGI (Bologna, Italy) Carmela MUSELLA (Napoli, Italy) Martin L. NEWELL (Galway, Ireland) Chiara NICOTERA (Salerno, Italy) Francesco ORIENTE (Trento, Italy) ii iii Participants Christos A. PALLIKAROS (Nicosia, Cyprus) Liviana PALMISANO (Padova, Italy) Bernhard AMBERG (Mainz, Germany) Eduardo PASCALI (Lecce, Italy) Antonio AULETTA (Napoli, Italy) Alberto PASSUELLO (Padova, Italy) Adolfo BALLESTER-BOLINCHES (Valencia, Spain) Elisabetta PASTORI (Torino, Italy) Andrea CARANTI (Trento, Italy) Jacopo PELLEGRINI (Padova, Italy) Francesco CATINO (Lecce, Italy) Elisa PERRONE (Lecce, Italy) Ilaria COLAZZO (Lecce, Italy) Raffaele RAINONE (Padova, Italy) Ulderico DARDANO (Napoli, Italy) David RILEY (Western Ontario, Canada) Rex DARK (Galway, Ireland) Silvana RINAURO (Potenza, Italy) Maria DE FALCO (Napoli, Italy) Roberto RIZZO (Lecce, Italy) Costantino DELIZIA (Salerno, Italy) Derek J. S. ROBINSON (Urbana, USA) Eloisa DETOMI (Padova, Italy) Emanuela ROMANO (Salerno, Italy) Dikran Dikranjan (Udine, Italy) Alessio RUSSO (Caserta, Italy)