Abstract.
We describe local properties of the first fundamental form for a C∞ surface in Euclidean 3-space \(\mathbb{E}^{3} \) which fails to immerse on a small set D0. We then show that (subject to the regularity assumption KdA ≠ 0, on D0) given such a locally defined analytic tensor on an open subset of the plane there exists an analytic mapping into \(\mathbb{E}^{3} \) whose first fundamental form is the given tensor. We then describe several global consequences of the condition KdA ≠ 0 on D0.
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Kossowski, M. Realizing a singular first fundamental form as a nonimmersed surface in Euclidean 3-space. J. geom. 81, 101–113 (2004). https://doi.org/10.1007/s00022-004-2511-y
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DOI: https://doi.org/10.1007/s00022-004-2511-y