"polyconvexity" meaning in English

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  "etymology_text": "From poly- + convexity.",
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          "ref": "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):",
          "text": "Thus we negatively answer Morrey's conjecture in the subclass of isochoric nonlinear energies, since polyconvexity implies quasiconvexity.",
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        "A generalization of the notion of convexity for functions defined on spaces of matrices."
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        "(mathematics) A generalization of the notion of convexity for functions defined on spaces of matrices."
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  "word": "polyconvexity"
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  "etymology_text": "From poly- + convexity.",
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