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Umbilical Cord Blood pH Level, Apgar Score, and Attention-Deficit/Hyperactivity Disorder.

open access: yesJAMA Netw Open
Pedersen MV   +4 more
europepmc   +1 more source

On conditions for existence of umbilical points on a convex surface

Siberian Mathematical Journal, 1995
Let \(F\) be a connected complete \(C^\infty\) surface homeomorphic to a plane in the Euclidean space \(\mathbb{R}^3\) and \(k_1\), \(k_2\) its principal curvatures. The author establishes the following result. If the surface \(F\) satisfies one of the following conditions: (i) the integral curvature is strictly smaller than \(2\pi\), (ii) the Gauss ...
V A Toponogov
exaly   +2 more sources

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