# Density-functional theory as an example for the construction of stationarity principles.

@article{Ernzerhof1994DensityfunctionalTA, title={Density-functional theory as an example for the construction of stationarity principles.}, author={Ernzerhof}, journal={Physical review. A, Atomic, molecular, and optical physics}, year={1994}, volume={49 1}, pages={ 76-80 } }

From the very beginning quantum statistical mechanics can be formulated in terms of a thermodynamic potential, which has the electron density as the basic variable. By employing a well-known procedure in quantum statistical mechanics for the construction of stationarity principles [T. D. Lee and C. N. Yang, Phys. Rev. 113, 1165 (1959); 117, 22 (1960)], the variational principles of Hohenberg, Kohn [P. Hohenberg and W. Kohn, Phys. Rev. B 136, 864 (1964)], and Mermin [N. D. Mermin, Phys. Rev. A… Expand

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