Unsolved Problems on Mathematics for the 21st Century

"Unsolved Problems on Mathematics for the 21st Century - A Tribute to Kiyoski Iséki's 80th Birthday" is a book dedicated to Dr. Kiyoshi Iséki for his contribution in the scientific, academic and public community. The book is a collection of papers written by scientists in evidence in the area of Pure and Applied Mathematics, Logic, and related issues. The book refers to some significant open problems related to Pure and Applied Mathematics, Mathematical Logic, Foundations of Mathematics, Theoretical Computer Science, correlated themes, in this century. It defines the own style of the book.