with respect to n ( r → ) {\displaystyle n({\vec {r}})} , assuming one has got reliable expressions for T [ n ] {\displaystyle \,\!T[n]} and U [ n ] {\displaystyle \,\!U[n]} . A successful minimization of the energy functional will yield the ground-state density n 0 {\displaystyle \,\!n_{0}} and thus all other ground-state observables.

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