# A Nash–Kuiper theorem for $C^{1,\frac{1}{5}-\delta}$ immersions of surfaces in 3 dimensions

De Lellis, Camillo; Inauen, Dominik; Székelyhidi, Jr., László (2018). A Nash–Kuiper theorem for $C^{1,\frac{1}{5}-\delta}$ immersions of surfaces in 3 dimensions. Revista matemática iberoamericana, 34(3):1119-1152.

## Abstract

We prove that, given a $C^2$ Riemannian metric $g$ on the 2-dimensional disk $D_2$, any short $C^1$ immersion of $(D_2,g)$ into $\mathbb{R}^3$ can be uniformly approximated with $C^{1,α}$ isometric immersions for any $α<\frac{1}{5}$. This statement improves previous results by Yu. F. Borisov and of a joint paper of the first and third author with S. Conti.

## Abstract

We prove that, given a $C^2$ Riemannian metric $g$ on the 2-dimensional disk $D_2$, any short $C^1$ immersion of $(D_2,g)$ into $\mathbb{R}^3$ can be uniformly approximated with $C^{1,α}$ isometric immersions for any $α<\frac{1}{5}$. This statement improves previous results by Yu. F. Borisov and of a joint paper of the first and third author with S. Conti.

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