What does "tautology" mean?

A tautology is a statement that is true by necessity or by virtue of its logical form. It is a statement that is always true, regardless of the circumstances or conditions. In other words, a tautology is a statement that is redundant or unnecessary because it simply restates something that is already known or implied.

A tautology is a statement that is true by virtue of its logical structure alone, regardless of its factual content. In other words, a tautology is a statement that is always true because of the way it is phrased, rather than because of any external facts.

For example, the statement "All bachelors are unmarried men" is a tautology. This is because the definition of "bachelor" is "an unmarried man." Therefore, the statement "All bachelors are unmarried men" is always true, regardless of whether or not any actual bachelors exist.

Tautologies are often used in logic to simplify arguments and to clarify the relationships between different statements. They can also be used to prove other statements, since a statement that is true by definition can be used to prove any other statement that follows logically from it.

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