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Introduce isotropic hardening

  • a class Nonlinearity is added which implements value(), gradient(), hessian() and subdifferential() for a given DissipationDensity
  • the class DissipationFunctional is completely cleaned up and now better to read
  • the coefficient vectors are given in std::vector format now
  • we need the elementVolumes and the previousEta for evaluation of the nonlinearity and the direct solver
Edited by Jaap, Patrick

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