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The Monge-Ampere system in dimension two and codimension three

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arxiv 2501.12474 v1 pith:6VSGZUF6 submitted 2025-01-21 math.AP

classification math.AP
keywords mathcalapproachescodimensionconstructionsdimensionexponentflexibilityolder
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abstract

We revisit the convex integration constructions for the Monge-Amp\`ere system and prove its flexibility in dimension $d=2$ and codimension $k=3$, up to $\mathcal{C}^{1,1-1/\sqrt{5}}$. To our knowledge, it is the first result in which the obtained H\"older exponent $1-\frac{1}{\sqrt{5}}$ is larger than $1/2$ but it is not contained in the full flexibility up to $\mathcal{C}^{1,1}$ result. Previous various approaches, based on Kuiper's corrugations, always led to the H\"older regularity not exceeding $\mathcal{C}^{1,1/2}$, while constructions based on the Nash spirals (when applicable) led to the regularity $\mathcal{C}^{1,1}$. Combining the two approaches towards an interpolation between their corresponding exponent ranges has been so far an open problem.

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Cited by 3 Pith papers

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  1. Constancy of the index for gradient mappings

    math.AP 2025-06 accept novelty 8.0 of 10

    For a C^{1,1} function whose Hessian has uniformly positive or negative determinant almost everywhere, the index of the Hessian is constant almost everywhere, proving Šverák's 1992 conjecture.

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    math.AP 2026-07 conditional novelty 7.0 of 10

    Every short immersion into R^{d+k} is uniformly approximable by C^{1,α} isometric immersions for α < min{(r+β)/2, 1/(1+d(d+1)/k)}.

  3. Isometric Immersions and Weak Solutions to the Darboux Equation

    math.AP 2025-08 conditional novelty 7.0 of 10

    For Holder exponents greater than 1/2, weak C^{1,theta} solutions of the Darboux equation are equivalent to C^{1,theta} isometric immersions, via a new distributional Gaussian curvature and flatness criterion.

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