Home › Forums › density functional theory › functions and functionals › Functional This topic has 0 replies, 1 voice, and was last updated 1 week, 4 days ago by Zeno. Viewing 1 post (of 1 total) Author Posts October 1, 2025 at 12:37 pm #13306 ZenoParticipant a functional comes up in the principle of least action in classical mechanics. The action is then a functional of the path 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