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- Newsgroups: sci.logic
- Path: sparky!uunet!mcsun!sunic!sics.se!torkel
- From: torkel@sics.se (Torkel Franzen)
- Subject: Re: implication truth table
- In-Reply-To: sasghm@theseus.unx.sas.com's message of Wed, 18 Nov 1992 13:49:39 GMT
- Message-ID: <TORKEL.92Nov18175759@bast.sics.se>
- Sender: news@sics.se
- Organization: Swedish Institute of Computer Science, Kista
- References: <1992Nov16.162733.1831@falcon.aamrl.wpafb.af.mil>
- <TORKEL.92Nov18100921@isis.sics.se> <Bxwzqs.H8L@unx.sas.com>
- Date: Wed, 18 Nov 1992 16:57:59 GMT
- Lines: 12
-
- In article <Bxwzqs.H8L@unx.sas.com> sasghm@theseus.unx.sas.com (Gary Merrill)
- writes:
-
- >Perhaps another way of putting this is that the usual truth-functional
- >interpretation of the material conditional is about the weakest
- >interpretation that satisfies all the "usual" rules of inference.
-
- "Material conditional" is a bit misleading here, since the rules I
- mentioned are all intuitionistically valid. That is, the inference of
- "if A then B" from "not A" is not dependent on any equivalence of
- "if A then B" with "not A or B", which is often taken to be required by
- the "material conditional".
-