, which is bounded by a rectifiable curve, is a space of curvature not greater than k in the sense of Aleksandrov. This generalizes a classical theorem by Shefel' on saddle surfaces in 𝔼3.">
本文证明了任何非正规的非参数马鞍面在三维空间的非零常数曲率 k 有限的可矫正的曲线,是一个空间曲率不大于 k 在Aleksandrov的感觉。这个概括一个经典定理Shefel的鞍形表面 & # x1D53C; 3 。