Hi all, "The least upper bound of a set of real numbers is often called the supremum, the greatest lower bound its infimum. In general the supremum and infimum of a set ARE MEMBERS OF THE SET or at least LIMITS OF SEQUENCES OF MEMBERS OF THE SET." [capitalization is mine] In this case the suprenum is infinity. Introduction to Calculus and Analysis Courant and John Vol. 1, pp. 97, Section e. 1965 Edition Library of Congress: 65-16403 Jim Choate CyberTects ravage@ssz.com