Home › Forums › density functional theory › functions and functionals › functional This topic has 0 replies, 1 voice, and was last updated 1 week, 6 days ago by BjornDB. Viewing 1 post (of 1 total) Author Posts September 29, 2025 at 7:50 pm #13274 BjornDBParticipant Probably the most famous functional I learned as a physicist is the action functional, with which the principle of least action can be used to calculate the equation of motion of a system. 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