tautologies in a sentence

Examples

1. This means the argument is a tautology; it is true in all cases.
2. Tautology _ asking, rather hopefully, whether telling the joke could get him disbarred.
3. It's the tautology, stupid.
4. The following are truth-functional tautologies.
5. is the tautology p \ leftrightarrow p.
6. :Another way of looking at tautologies is that they're true by definition.
7. This sounds almost like a tautology, but the result is still non-trivial.
8. Evidently the term is not a tautology even given the obvious focus of this book.
9. And I seem to remember you on Brews's talk page denying the tautology.
10. So the statement is really a tautology.