"511961" . "8"^^ . "eigenvalues; Laplacians"@en . . "38" . "[3B77C9A9830D]" . "P(KSK1010104), Z(AV0Z1048901)" . . . "An isoperimetric problem for point interactions" . . "Isoperimetrick\u00FD probl\u00E9m pro bodov\u00E9 interakce"@cs . "RIV/61389005:_____/05:00032289" . "Journal of Physics. A - Mathematical and General Physics" . "An isoperimetric problem for point interactions"@en . "An isoperimetric problem for point interactions"@en . "Isoperimetrick\u00FD probl\u00E9m pro bodov\u00E9 interakce"@cs . "0305-4470" . . "We consider a Hamiltonian with N point interactions in R-d, d = 2, 3, all with the same coupling constant, placed at vertices of an equilateral polygon P-N. It is shown that the ground-state energy is locally maximized by a regular polygon. The question whether the maximum is global is reduced to an interesting geometric problem."@en . . . "4795;4802" . . . "We consider a Hamiltonian with N point interactions in R-d, d = 2, 3, all with the same coupling constant, placed at vertices of an equilateral polygon P-N. It is shown that the ground-state energy is locally maximized by a regular polygon. The question whether the maximum is global is reduced to an interesting geometric problem." . . "Exner, Pavel" . "22" . . "1"^^ . "1"^^ . "An isoperimetric problem for point interactions" . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . . . "RIV/61389005:_____/05:00032289!RIV06-AV0-61389005" . . "Uva\u017Eujeme Hamiltoni\u00E1n s N bodov\u00FDmi interakcemi ve vrcholech rovnostrann\u00E9ho mnoho\u00FAheln\u00EDku a ukazujeme, \u017Ee z\u00E1kladn\u00ED stav je maxim\u00E1ln\u00ED pro pravideln\u00FD mnoho\u00FAheln\u00EDk."@cs . .