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	<title>Comments on: Induction, any hope?</title>
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		<title>By: admin</title>
		<link>http://www.aboutlogic.info/induction-any-hope/comment-page-1#comment-5566</link>
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		<pubDate>Wed, 10 Mar 2010 02:02:24 +0000</pubDate>
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  In article &lt;38BD9ED1.6B8A5...@cwcom.net&gt;, &lt;br /&gt; &#160; Peter Percival &lt;peter.perci...@cwcom.net&gt; wrote: &lt;br /&gt; &lt;p&gt;- Hide quoted text -- Show quoted text -&lt;/p&gt;&gt; Given the truth of finitely many formulae Fa, Fb, Fc,... in a language &lt;br /&gt; &gt; with names a, b, c,... for infinitely many different individuals; it &lt;br /&gt; &gt; would be nice to infer that (for all x)Fx has non-zero probability. &lt;br /&gt; &gt; Hume and Popper say one can&#039;t, and I believe them. &lt;br /&gt; &lt;p&gt;&gt; Nevertheless(!) can one define a language L like, but not necessarily &lt;br /&gt; &gt; identical to, that of ordinary first order logic (though it must have &lt;br /&gt; &gt; names for infinitely many individuals and some wff that are &quot;singular&quot; &lt;br /&gt; &gt; and some that are &quot;universal&quot;); such that a probability P may be &lt;br /&gt; defined &lt;br /&gt; &gt; on a sigma-algebra of sets of wff of L with this property: &lt;br /&gt; &gt; For some universal wff U, there is a finite set S of singular wff, st &lt;br /&gt; &gt; S does not logically imply U, &lt;br /&gt; &gt; but P(U given S) = P({U} intersect S)/P(S) &lt;&gt; 0 &lt;br /&gt; &gt; ? &lt;br /&gt; &lt;/p&gt;&lt;p&gt;&gt; I feel that I have not worded that very clearly. &#160;My apologies if I &lt;br /&gt; &gt; haven&#039;t. &#160;What I&#039;m trying to ask (of course) is &quot;Can finitely-many &lt;br /&gt; &gt; singular statements &#039;give&#039; a universal statement a non-zero &lt;br /&gt; &gt; probability?&quot; &lt;br /&gt; &lt;/p&gt;&lt;p&gt;&gt; PP &lt;br /&gt; &lt;br /&gt;&#160; &#160; &#160;Yes, of course, given the context. The snowflake example comes to &lt;br /&gt; mind. It depends on the way the propositions are worded. You might want &lt;br /&gt; to read &quot;Scientific Reasoning&quot; by Howson and Urbach for a defense of &lt;br /&gt; Bayesianism. They get heavily into the probability. I think Popper is &lt;br /&gt; wrong (even though he is real big in my book) about meaning not being &lt;br /&gt; important in the philosophy of science. I think the Raven&#039;s paradox &lt;br /&gt; supercedes the problem of induction. Of course, this thing didn&#039;t come &lt;br /&gt; along &#039;till way after Hume&#039;s death (another one in my hall of fame.) &lt;br /&gt; Give Quine a try. He&#039;s great also. Him and Popper disagree with what you &lt;br /&gt; are driving at above, Keep up the good work, PP. &lt;br /&gt; &lt;/p&gt;&lt;p&gt;Sent via Deja.com http://www.deja.com/ &lt;br /&gt; Before you buy. &lt;br /&gt;
  
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		<content:encoded><![CDATA[<p>In article &lt;38BD9ED1.6B8A5&#8230;@cwcom.net&gt;, <br /> &nbsp; Peter Percival &lt;peter.perci&#8230;@cwcom.net&gt; wrote: <br /> 
<p>- Hide quoted text &#8212; Show quoted text -</p>
<p>&gt; Given the truth of finitely many formulae Fa, Fb, Fc,&#8230; in a language <br /> &gt; with names a, b, c,&#8230; for infinitely many different individuals; it <br /> &gt; would be nice to infer that (for all x)Fx has non-zero probability. <br /> &gt; Hume and Popper say one can&#8217;t, and I believe them. <br /> 
<p>&gt; Nevertheless(!) can one define a language L like, but not necessarily <br /> &gt; identical to, that of ordinary first order logic (though it must have <br /> &gt; names for infinitely many individuals and some wff that are &quot;singular&quot; <br /> &gt; and some that are &quot;universal&quot;); such that a probability P may be <br /> defined <br /> &gt; on a sigma-algebra of sets of wff of L with this property: <br /> &gt; For some universal wff U, there is a finite set S of singular wff, st <br /> &gt; S does not logically imply U, <br /> &gt; but P(U given S) = P({U} intersect S)/P(S) &lt;&gt; 0 <br /> &gt; ?  </p>
<p>&gt; I feel that I have not worded that very clearly. &nbsp;My apologies if I <br /> &gt; haven&#8217;t. &nbsp;What I&#8217;m trying to ask (of course) is &quot;Can finitely-many <br /> &gt; singular statements &#8216;give&#8217; a universal statement a non-zero <br /> &gt; probability?&quot;  </p>
<p>&gt; PP </p>
<p>&nbsp; &nbsp; &nbsp;Yes, of course, given the context. The snowflake example comes to <br /> mind. It depends on the way the propositions are worded. You might want <br /> to read &quot;Scientific Reasoning&quot; by Howson and Urbach for a defense of <br /> Bayesianism. They get heavily into the probability. I think Popper is <br /> wrong (even though he is real big in my book) about meaning not being <br /> important in the philosophy of science. I think the Raven&#8217;s paradox <br /> supercedes the problem of induction. Of course, this thing didn&#8217;t come <br /> along &#8217;till way after Hume&#8217;s death (another one in my hall of fame.) <br /> Give Quine a try. He&#8217;s great also. Him and Popper disagree with what you <br /> are driving at above, Keep up the good work, PP.  </p>
<p>Sent via Deja.com <a href="http://www.deja.com/" rel="nofollow">http://www.deja.com/</a> <br /> Before you buy. </p>
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