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Tagged with propositions tautology
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If logical propositions aren't tautologies (a la Wittgenstein), then what could they be?
This is a historical question about philosophical views. I believe I understand the claim made by Wittgenstein and others that logical propositions are tautologies. I'd like to know what other views ...
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Making 'sense' of Wittgenstein's senselessness / nonsense distinction in the Tractatus
For this question I'm just considering Wittgenstein's theory at the time of the Tractatus.
As far as I know, for Wittgenstein:
Meaning - The object denoted by a word (i.e. referent).
Sense - The ...
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How do you prove that this is a tautology?
((p->q) and (r->s) and (p or r)) -> (q or s)
How would you prove that this is a tautology? Using natural deduction?
My attempt on this question is the following.
Since a tautology means W entails ...
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