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Keywords:
variational principles; constraints; Legendre-Fenchel transformation
variational principles; constraints; Legendre-Fenchel transformation
Summary:
Two improvements of variational formulations of mechanics are proposed. The first consists in a modification of the definition of equilibrium. The second consists in adding elements of control by external devices. In the present note the proposed improvements are applied to variational principles of statics. Numerous examples are given.
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