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Reconsidering the variational procedure for uniaxial systems modeled bycontinuous free energy functionals, we derive new general conditions forthermodynamic extrema. The utility of these conditions is briefly illustratedon the models for the classes I and II of incommensurate-commensurate systems.Comment: 5 pages, to be published in Phys. Rev. Let

General Criteria for the Stability of Uniaxially Ordered States of Incommensurate-Commensurate Systems