Practice question · True or false
A tautology carries no information about how the world is.
Hints
- Ask what a tautology rules out.
- It is true under every assignment, so it excludes no possibility at all.
Show the answer
True
Why
True, a tautology is true in every case, so it excludes nothing. "It will rain or it will not" is useless as a forecast precisely because no weather could falsify it. Only contingent sentences carry information.
Practise Tautology, Entailment and Consistency
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More questions on Tautology, Entailment and Consistency
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