<div dir="ltr">Exactly.<div>We may wake up tomorrow, and almost all physics (and historical e evidence) will have radically changed right?</div><div><br></div><div>Brent</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 20, 2020 at 5:08 PM Stathis Papaioannou 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><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 21 Apr 2020 at 04:54, Dave Sill via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org" target="_blank">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 dir="ltr"><div dir="ltr">On Mon, Apr 20, 2020 at 2:29 PM William Flynn Wallace via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org" target="_blank">extropy-chat@lists.extropy.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:"comic sans ms",sans-serif;font-size:small;color:rgb(0,0,0)">And in any case. you can't prove a negative.</div></div></blockquote><div><br></div><div>Wrong.</div><div><br></div><div><a href="https://www.psychologytoday.com/us/blog/believing-bull/201109/you-can-prove-negative" target="_blank">https://www.psychologytoday.com/us/blog/believing-bull/201109/you-can-prove-negative</a></div><div><br></div><div>"The fact is, however, that this supposed "law of logic" is no such thing. As Steven D. Hales points in his paper "You Can Prove a Negative," "You can't prove a negative" is a principle of folk logic, not actual logic.</div><br>Notice, for a start, that "You cannot prove a negative" is itself a negative. So, if it were true, it would itself be unprovable. Notice that any claim can be transformed into a negative by a little rephrasing—most obviously, by negating the claim and then negating it again. "I exist" is logically equivalent to "I do not not exist," which is a negative. Yet here is a negative it seems I might perhaps be able to prove (in the style of Descartes—I think, therefore I do not not exist!).<br><br>Of course, those who say "You can't prove a negative" will insist that I have misunderstood their point. As Hales notes, when people say, "You can't prove a negative," what they really mean is that you cannot prove that something does not exist. If this point were correct, it would apply not just to supernatural beings lying beyond the cosmic veil but also to things that might be supposed to exist on this side of the veil, such as unicorns, Martians, rabbits with 20 heads, and so on. We would not be able to prove the nonexistence of any of these things either."</div></div></blockquote><div dir="auto"><br></div><div dir="auto">In general, you can only prove things in mathematics, not in science.</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"></div></div>
</blockquote></div></div>-- <br><div dir="ltr">Stathis Papaioannou</div>
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