Tautology, Contradiction, Contingency & Satisfiability

Discrete Mathematics: Tautology, Contradiction, Contingency & Satisfiability
Topics discussed:
1. Tautology.
2. Tautology example.
3. Contradiction.
4. Contradiction example.
5. Contingency.
6. Contingency example.
7. Satisfiability.
8. Satisfiability example.
9. Unsatisfiability.
10. Valid proposition.
11. Invalid proposition.

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