tautologikus

Tautologikus is a term used in logic and linguistics to describe a statement that is always true by virtue of its logical form. This means that regardless of the truth values of the individual propositions within the statement, the entire statement will always be true. A classic example in propositional logic is "P or not P". If P is true, then "P or not P" is true. If P is false, then "not P" is true, making "P or not P" true. Therefore, the statement is always true.

In natural language, tautologies often appear as seemingly redundant statements that nevertheless convey a sense of obviousness or inevitability. Phrases like "It is what it is" or "Business is business" can be considered linguistic tautologies. While they might seem uninformative on the surface, they can serve to express acceptance of a situation or to emphasize a particular characteristic. The term can also be used pejoratively to describe statements that are perceived as lacking substance or offering no new information, essentially stating the obvious. The analysis of tautologies is fundamental to understanding logical consistency and the structure of meaningful propositions.