In NARS, if we have Ben --> AGI-author <f1;c1> Dude --> AGI-author <f2;c2> |- Dude --> Ben <f3;c3>
then f1 only contributes to c3, not to f3, because it decides whether "AGI-author" is in the intension of Ben, and therefore whether the premises really have anything to say about the conclusion. However it doesn't say about how much of the evidence is positive/negative. On the other hand, f2 have nothing to do with c3 (whether "AGI-author" is indeed evidence for the conclusion), but if there is evidence, f2 decides whether (and how much) it is positive evidence --- given Ben being AGI-author, if Dude is AGI-author, too, it is positive evidence for "Dude --> Ben" (which means Dude inherits Ben's properties, rather than the two are identical), if Dude is not AGI-author, then it is negative evidence. Unlike in deduction, in abduction and induction the truth-value function is not symmetric to the two premises, and this is especially true when the conclusion is negative. This result directly follows from the definition of evidence in NARS. I'd rather not to spend a lot of time to debate on this topic again. After all, "doesn't feel right to Ben" is a much less serious crime than doesn't feel right to "any intelligent human", and I have little hope in changing Ben's intuition. ;-) Pei On Wed, Sep 24, 2008 at 12:33 PM, Ben Goertzel <[EMAIL PROTECTED]> wrote: > >> >> If we have >> >> Ben ==> AGI-author <s1> >> Dude ==> AGI-author <s2> >> |- >> Dude ==> Ben <s3> >> >> the PLN abduction rule would yield >> >> s3 = s1 s2 + w (1-s1)(1-s2) > > > But ... before we move on to psychic powers, let me note that this PLN > abduction strength rule (simplified for the case of equal node > probabilities) does depend on both s1 and s2 > > The NARS abduction strength rule depends on only one of the premise > strengths, which intuitively and pretheoretically does not feel right to > me... > > ben g > > ________________________________ > agi | Archives | Modify Your Subscription ------------------------------------------- agi Archives: https://www.listbox.com/member/archive/303/=now RSS Feed: https://www.listbox.com/member/archive/rss/303/ Modify Your Subscription: https://www.listbox.com/member/?member_id=8660244&id_secret=114414975-3c8e69 Powered by Listbox: http://www.listbox.com
