[lit-ideas] Re: Patent Tautologies: The Implicatures
- From: Donal McEvoy <donalmcevoyuk@xxxxxxxxxxx>
- To: "lit-ideas@xxxxxxxxxxxxx" <lit-ideas@xxxxxxxxxxxxx>
- Date: Wed, 2 Dec 2015 13:55:32 +0000 (UTC)
"If an argument form is valid, the conjunction of the premises will be
logically equivalent to the conclusion and this can be clearly seen in a
truth table; it is displayed. The concept of TAUTOLOGY is thus central to
Wittgenstein's Tractarian account of logical consequence, which is
strictly
deductive.">
This notion of valid argument may be attacked, as may the notion of logical
equivalence and how these relate to deduction. There may be valid deductive
arguments where the conclusion will not be logically equivalent to the
conjunction of the premises. That is, conclusion A may follow from premise B,
C, D even though A is neither logically equivalent to B or C or D nor logically
equivalent (in any useful sense) to their conjunction.
DL
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