Home › Forums › density functional theory › functions and functionals › Functional This topic has 0 replies, 1 voice, and was last updated 1 week, 2 days ago by Nikol. Viewing 1 post (of 1 total) Author Posts October 4, 2025 at 11:32 am #13392 NikolParticipant The functional that I’m most familiar with is the Action Functional in Classical Mechanics. It could be encountered in Lagrangian Mechanics (Euler-Lagrangian equations) as a “replacement” for Newton’s force-based approach. 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