[From the act to thought - a psychoanalytic understanding of aggression]

The author lists the different positions of Freud with respect ot the comprehension of the aggressive impulse on a metapsychological as well as on a clinical level, resulting in the concept of the death instinct in 1920. From the cruelty of the child over the instinct for mastery to the comprehension of the economy of instincts in 1915 in "Instincts and their Vicissitudes", Freud demonstrates his hesitations polarized by the conflict with Adler in regard to the aggressivity. The Post-Freudians and in particular Melanie Klein have retaken the texts of Freud in order to go beyond the compulsion of the almost fetishistic instinctual duality in the Kleinian group, more or less disputed by the structural analysts who speak about the neutralization of aggressive impulse.