answer Home › Forums › density functional theory › correlation › answer This topic has 0 replies, 1 voice, and was last updated 1 week, 4 days ago by stephen wienk. Viewing 1 post (of 1 total) Author Posts October 6, 2026 at 11:01 am #15236 stephen wienkParticipant In a classical system, the particles are point-like and the 2-body systems can be solved exactly. In a quantum system, particles are represented by wave functions and, because the particles are fermions, they have an exchange energy. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In