polyconvexity

poly- +‎ convexity

polyconvexity (uncountable)

1. (mathematics) A generalization of the notion of convexity for functions defined on spaces of matrices.
   • 2015, Robert J. Martin, Ionel-Dumitrel Ghiba, Patrizio Neff, “Rank-one convexity implies polyconvexity for isotropic, objective and isochoric elastic energies in the two-dimensional case”, in (Please provide the book title or journal name)‎:

     Thus we negatively answer Morrey's conjecture in the subclass of isochoric nonlinear energies, since polyconvexity implies quasiconvexity.

• polyconvex

• Polyconvex function on Wikipedia.Wikipedia