 Rather, it is an inextricable part of many other areas of thought, such as phenomenology, structural semiotics, hermeneutics, existentialism, deconstruction and critical theory.In the West, inquiry into language stretches back to the 5th century BC with Socrates, Plato, Aristotle, and the Stoics.Both in India and in Greece, linguistic speculation predates the emergence of grammatical traditions of systematic description of language, which emerged around the 5th century BC in India (see Yāska), and around the 3rd century BC in Greece (see Rhianus).