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In linguistics , phraseology is the study of set or fixed expressions , such as idioms , phrasal verbs , and other types of multi-word lexical units ( often collectively referred to as phrasemes ) , in which the component parts of the expression take on a meaning more specific than or otherwise not predictable from the sum of their meanings when ...
For example, because â¨ Â¬ is a tautology of propositional logic, (â (=)) â¨ (Â¬ â (=)) is a tautology in first order logic. Similarly, in a first-order language with a unary relation symbols R,S,T, the following sentence is a tautology: