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1. A compound statement that is always true is called a tautology.
2. In logic, a tautology is a statement that is true for all possible truth values of its components. It is a statement that is inherently true, regardless of the truth values of its individual parts.
3. For example, the statement "A or not A" is a tautology because it is always true. No matter the truth value of A (true or false), the statement "A or not A" will always be true.
4. Tautologies are essential in logic as they help establish fundamental truths and serve as a basis for reasoning and argumentation.
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