The concept of relations is the starting point for the concept of functions in real numbers. In addition, concepts of ordered pair, Cartesian product and the Cartesian plane itself. One of the main mathematicians who contributed to this concept was Julius Wilhelm Richar Dedekind. Tribute to Dedekind Our honoree today is Julius Wilhelm Richar Dedekind. He was one of four children in a Lutheran family from Braunschweig, Germany. At the age of 19 he entered his doctorate in Gottingen, at 22 he completed it. A student of Dirichlet, he taught secondary education in Brunswick until the last years of his life. He was very concerned about the nature of functions and numbers. In this way, he has been focused on the problem of irrational numbers since 1858 when he taught Calculus.