Abstract
Density functional theory (DFT) has become a basic tool for the study of electronic structure of matter, in which the Hohenberg–Kohn theorem plays a fundamental role in the development of DFT. In this paper, we present a simple, selfcontained and mathematically rigorous proof using the Fundamental Theorem of Algebra. We also show the Hohenberg–Kohn theorem for systems with some more general external potentials.
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