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The null set of the Euler-Lagrange operator. (English) Zbl 0125.33002

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[1] Ericksen, J. L.: Nilpotent Energies in Liquid Crystal Theory. Arch. Rational Mech. Anal. 10, 189-196 (1962). · Zbl 0109.23002 · doi:10.1007/BF00281186
[2] Edelen, D. G. B.: The Invariance Group for Hamiltonian Systems of Partial Differential Equations. Arch. Rational Mech. Anal. 5, 95-176 (1960). · Zbl 0093.17001 · doi:10.1007/BF00252900
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