Delay tolerant networks (DTNs) are wireless networks with intermittent connections. Node mobility, limited radio range and power cause intermittency. These networks have different applications such as space searching, wild life tracking, military battlefields and etc. Conventional routing approaches are not practical in DTN because of intermittency. So, routing is a challenging matter. This pap...

In this paper we compare two real root isolation methods using Descartes’ Rule of Signs: the Interval Bisection method, and the Continued Fractions method. We present some time-saving improvements to both methods. Comparing computation times we conclude that the Continued Fractions method works much faster save for the case of very many very large roots.