Sempre uguale sempre diverso. Riflessioni sulla nozione di invariante linguistico

The paper aims to analyze the concept of linguistic invariant. It is a theoretical tool that plays a pivotal role in several research programs: from the typological linguistics to the theory of enunciative and predicative operations, until some branches of the so-called Minimalist program. As we will show, it is necessary to distinguish between «universal of language» and «linguistic invariant».