Intervals play a pivotal role in both theoretical mathematics and applied mathematics. As a consequence, interval computation is becoming increasingly used in several fields of Mathematics and other applied sciences. However, only a few computer programs include specialized tools and libraries for interval computation so far. In this paper we describe a new package for dealing with single-valued interval computation on real numbers. The package, developed by the authors in freeware program Maxima, version 5.23.2, allows the user to manipulate single-valued real and extended intervals and carry out the most typical set operations on intervals (such as union, intersection and difference) in a smoothly and user-friendly way. The main features of our package are discussed throughout the paper.Several illustrative examples, aimed to show the good performance of the package, are also given.

Un tipo especial de gráficas de curvas fractales con Mathematica 11.0. a special type of graphs of fractal curves with mathematica 11.