Home › Forums › density functional theory › functions and functionals › Functional example This topic has 0 replies, 1 voice, and was last updated 2 years, 2 months ago by thsr. Viewing 1 post (of 1 total) Author Posts October 4, 2022 at 12:04 pm #6861 thsrParticipant Area under curve of a positive function is a functional, integral maps a function to a number (area). 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