tautologies in a sentence

Examples

1. It seems a tautology, but it is not.
2. Thus by definition our formula is not a tautology.
3. Many tautologies of classical logic can no longer be proved within intuitionistic logic.
4. "Survival of the fittest " is sometimes claimed to be a tautology.
5. Indeed, south of the tautology, " Mains of X farm ".
6. I don't think " truth " would qulify as a tautology.
7. Thus the statement " truth is not a lie " is a tautology.
8. :: It would appear to be a tautology.
9. What exactly are you saying is the tautology here?
10. The basic problem with that tautology is obvious.