2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109807The subject of our talk is the correct evaluation of interval extension of the function specified by the expression x^y without any constraints on the values of x and y. The core of our approach is a decomposition of the graph of x^y into a small number of parts which can be transformed into subsets of the graph of x^y for non-negative bases x. Because of this fact, evaluation of interval extension of x^y, without any constraints on x and y, is not much harder than evaluation of interval extension of x^y for non-negative bases x.submitted to the INTERVAL 2006 workshop to be held in St. Petersburg June 2006, Russia; extended abstractMathematical Softwaretext