Pei, Ben, I am going to try to spell out an arguments for each side (arguing for symmetry, then for asymmetry).
For Symmetry: Suppose we get negative evidence for "As are Bs", such that we are tempted to say "no As are Bs". We then consider the statement "Bs are As", with no other info. We think, "If we found a B that was an A, then we would also have found an A that was a B; I don't think any exist; so, I don't think there are any Bs that are As." Thus, evidence against "As are Bs" is also evidence against "Bs are As". Against Symmetry: If we are counting empirical frequencies, then an A that is not a B will lower the frequency of "As are Bs"; however, it will not alter the frequency count for "Bs are As". What this highlights for me is the idea that NARS truth values attempt to reflect the evidence so far, while probabilities attempt to reflect the world. --Abram ------------------------------------------- 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
