Home › Forums › density functional theory › functions and functionals › Functional This topic has 0 replies, 1 voice, and was last updated 1 week, 3 days ago by KobeVD. Viewing 1 post (of 1 total) Author Posts October 2, 2025 at 9:13 am #13330 KobeVDParticipant One of the examples that is obvious for any physicist would be the action functional S. Another example could be the Electrical Field Energy functional U(E), which gives the entire energy of an electric field. 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