Object a and privation. A significant case of retroaction in the psychoanalytic theory. A hypothesis is developed so that the elaboration of a particular category of "lack of object", which is the privation, done by Lacan throughout his fourth year in the Seminary, not only anticipates the ulterior "invention" of object a, but it also reveals, later, something that will be previously necessary to him.
Object a; privation; structure; subject
