Geodesic
Minimization of the energy functional on a special class of unitary operators
Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 146-150 
B. I. Zhilinskii; N. F. Stepanov. Minimization of the energy functional on a special class of unitary operators. Teoretičeskaâ i matematičeskaâ fizika, Tome 15 (1973) no. 1, pp. 146-150. http://geodesic.mathdoc.fr/item/TMF_1973_15_1_a13/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Conditions of an extremum of the energy functional under transformations of the Hamiltonian corresponding to a change of variables are found. The relationship of these conditions to hyperviriai theorems is considered.

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