WORDS LOCAL AND NONLOCAL IN DFT

[elewars <elewars at.at trentu.ca>]

Wednesday, 2000 June 21
 Hello,
 Does any one know why DFT functionals without gradient corrections are
 called _local_, while gradient-corrected functionals are called
 _nonlocal_? I am not asking about the theory behind these, but why these
 terms are used. I know that nonlocal has a certain meaning in quantum
 physics; does it have some special meaning in connection with
 mathematical functions or functionals?  The term nonlocal applied to
 gradient-corrected functional has been said to be mathematically wrong
 (A. St-Amant, Reviews in Computational chemistry, vol. 7, chapter 5,
 1996; p. 223).
 Thanks
 E. Lewars
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