<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">Thanks. Now - what is an odd perfect number? For that matter - never mind -looked it up. No practical applications in mind, just play, right?</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">This part of math is not a science. You know the Riemann conjecture to be true but cannot prove it - just backwards from science. bill w</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 24, 2021 at 12:32 PM spike jones via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="gmail-m_-4483004925243221952WordSection1"><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>…</b>> <b>On Behalf Of </b>William Flynn Wallace via extropy-chat<br><b>Subject:</b> [ExI] favor for a friend<u></u><u></u></p></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black">He wanted to know the meaning of this statement:<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:black">Mathematics is true, but it doesn't exist.</span><span style="font-size:10pt;font-family:Arial,sans-serif;color:black">"</span><span style="font-family:"Comic Sans MS";color:black"><u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif;color:black">bill </span><span style="font-size:10pt;font-family:Arial,sans-serif">w<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10pt;font-family:Arial,sans-serif"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black">Bill it is a mathematician’s joke, a little self-referencing humor. Pure mathematics is all about proving theorems. There are many mathematical ideas called conjectures until they are proven. An example is the conjecture that an odd perfect number exists. Plenty of people agree that one is true, but we have no known way of finding it, nor is there a proof that it exists (or doesn’t exist.)<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black">I chose that example because I worked on it for a while, but found myself not smart enough by a coupla orders of magnitude. A better example is the Riemann hypothesis:<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:28pt"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;color:black;background:white">In mathematics, the <b>Riemann hypothesis</b> is a </span><span style="font-size:20pt"><a href="https://en.wikipedia.org/wiki/Conjecture" title="Conjecture" target="_blank"><span style="font-size:18pt;color:black;background:white;text-decoration:none">conjecture</span></a></span><span style="font-size:18pt;color:black;background:white"> that the </span><span style="font-size:20pt"><a href="https://en.wikipedia.org/wiki/Riemann_zeta_function" title="Riemann zeta function" target="_blank"><span style="font-size:18pt;color:black;background:white;text-decoration:none">Riemann zeta function</span></a></span><span style="font-size:18pt;color:black;background:white"> has its </span><span style="font-size:20pt"><a href="https://en.wikipedia.org/wiki/Root_of_a_function" title="Root of a function" target="_blank"><span style="font-size:18pt;color:black;background:white;text-decoration:none">zeros</span></a></span><span style="font-size:18pt;color:black;background:white"> only at the negative even integers and </span><span style="font-size:20pt"><a href="https://en.wikipedia.org/wiki/Complex_number" title="Complex number" target="_blank"><span style="font-size:18pt;color:black;background:white;text-decoration:none">complex numbers</span></a></span><span style="font-size:18pt;color:black;background:white"> with </span><span style="font-size:20pt"><a href="https://en.wikipedia.org/wiki/Real_part" title="Real part" target="_blank"><span style="font-size:18pt;color:black;background:white;text-decoration:none">real part</span></a></span><span style="font-size:18pt;color:black;background:white"> </span><span class="gmail-m_-4483004925243221952num"><span style="font-size:16pt;color:black;background:white">1</span></span><span class="gmail-m_-4483004925243221952slash"><span style="font-size:16pt;color:black;border:1pt none windowtext;padding:0in;background:white">/</span></span><span class="gmail-m_-4483004925243221952den"><span style="font-size:16pt;color:black;border:1pt solid windowtext;padding:0in;background:white">2</span></span><span style="font-size:18pt;color:black;background:white">.</span><span style="font-size:28pt"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><a href="https://en.wikipedia.org/wiki/Riemann_hypothesis" target="_blank">https://en.wikipedia.org/wiki/Riemann_hypothesis</a><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black">That one is true, but no one has ever been able to prove it. That a proof doesn’t exist is more remarkable than my example with odd perfect numbers because math graduate students are given instruction on the Riemann zeta function and plenty of them take a shot it. But the zeta shoots back, hard. The fusillade of return fire is awesome on that one.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black">Do feel free to forward what I have written to your friend.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:18pt;font-family:"Comic Sans MS";color:black">spike<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Comic Sans MS";color:black"><u></u> <u></u></span></p></div></div></div></div>_______________________________________________<br>
extropy-chat mailing list<br>
<a href="mailto:extropy-chat@lists.extropy.org" target="_blank">extropy-chat@lists.extropy.org</a><br>
<a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat" rel="noreferrer" target="_blank">http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a><br>
</blockquote></div>