&gt; <i>Part of the problem is that we don&#x27;t have fast, perfect representations of real or complex numbers.</i><p>We&#x27;ll probably never have perfect representation of real numbers, but Gustafson&#x27;s unums seem to be the next best thing that can actually make a difference. His examples of how unums can solve the trickiest numerical challenges are impressive.<p><a href="http:&#x2F;&#x2F;insidehpc.com&#x2F;2015&#x2F;03&#x2F;slidecast-john-gustafson-explains-energy-efficient-unum-computing&#x2F;" rel="nofollow">http:&#x2F;&#x2F;insidehpc.com&#x2F;2015&#x2F;03&#x2F;slidecast-john-gustafson-explai...</a><p><a href="http:&#x2F;&#x2F;radiofreehpc.com&#x2F;tmp&#x2F;TheEndofErrorSampleChapter.pdf" rel="nofollow">http:&#x2F;&#x2F;radiofreehpc.com&#x2F;tmp&#x2F;TheEndofErrorSampleChapter.pdf</a>