ABSTRACT
This section is on vague concepts: those context-dependent concepts exhibiting an intrinsic tolerance to small variations and that intermingle with their negations.
After a short review of the ideas on vagueness of some modern relevant thinkers, the main problems briefly presented, through a definition of the truth values for vague statements, are those of the existence, use in the language, distinguishability, and orderings of vague predicates on a given universe of discourse.
