Home › Forums › density functional theory › functions and functionals › Functional This topic has 0 replies, 1 voice, and was last updated 2 years, 2 months ago by Ine Vanysacker. Viewing 1 post (of 1 total) Author Posts October 5, 2022 at 12:15 pm #6898 Ine VanysackerParticipant The Riemann integral is a functional. 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