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A Tautology … A Tautology … A Tautology
[By staff reporters]
The word tautology was used by the ancient Greeks to describe a statement that was asserted to be true merely by virtue of saying the same thing twice, a pejorative meaning that is still used for rhetorical tautologies. Between 1800 and 1940, the word gained new meaning in logic, and is currently used in mathematical logic to denote a certain type of propositional formula, without the pejorative connotations it originally possessed.
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A logical tautology is very different from a rhetorical tautology. It s a statement that will evaluate as true regardless of the truth values of the components of the sentence. For example, in logic or is non exclusive, which means that if we say A or B , the statement A or B would be true if A is true, if B is true, or if both are true. The only way A or B can be false is if both A and B are false. From this we can construct an example of a logical tautology. We can say A or not A , and it will be always be true regardless of whether A is true or not. This is the case because whenever A is false, not A is true, so at least one of the two will always be true. A real world example of a logical tautology would be the car is moving or it is not moving or the door is locked or it is not locked or the girl is pregnant or she is not pregnant.
MORE: https://en.wikipedia.org/wiki/Tautology_(logic)
Assessment
Can you think of any other linguistic tautologies?
Conclusion
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