EntityQ2621220· pop 11· linked from 173 articlesfunctional derivativeSign in to saveconcept in calculus of variationConnectionsdensity functional theoryEntityphysicsEntityInternational Standard Book NumberEntityDavid HilbertEntitymathematical analysisEntityfunctionEntityJoseph-Louis LagrangeEntityintegralEntityderivativeEntityquantum field theoryEntityrandom variableEntitystatistical mechanicsEntityHilbert spaceEntityvector calculusEntityfunctional analysisEntityRiemann hypothesisEntitypartial derivativeEntitydivergenceEntitycalculus of variationsEntityCarl Friedrich von WeizsäckerEntityCategoriesCalculus of variationsDifferential calculusDifferential operatorsTopological vector spacesVariational analysis