Branch points and non-density for finite-bending isometric immersions of hyperbolic surfaces

Gilad Derfner, Raz Kupferman, Cy Maor

The space of $W^{2,2}$-isometric immersions of a surface into ${\mathbb{R}}^3$ arises naturally in the variational theory of thin elastic sheets: it is precisely the finite-bending c…