INTERNATIONAL CONFERENCE ON NUMBER THEORY AND RELATED TOPICS Hanoi 12-15/12/2006   Local Organizing Committee  Ta Thi Hoai An - Institute of Mathematics, VAST, Hanoi, Vietnam Nguyen Viet Dung - Institute of Mathematics, VAST, Hanoi, Vietnam Phung Ho Hai - Institute of Mathematics, VAST, Hanoi, Vietnam Le Tuan Hoa - Institute of Mathematics, VAST, Hanoi, Vietnam Do Duc Thai - Hanoi University of Education Nguyen Quoc Thang - Institute of Mathematics, VAST, Hanoi, Vietnam, Chair