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Ph. Furtwängler 《Mathematische Annalen》1928,99(1):71-83
Ohne ZusammenfassungDie erste Mitteilung ist in Math. Annalen96 (1926), S. 169–175 erschienen. 相似文献
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Victor Bangert 《manuscripta mathematica》1978,25(4):397-420
While convex sets in Euclidean space can easily be approximated by convex sets with C -boundary, the C -approximation of convex sets in Riemannian manifolds is a non-trivial problem. Here we prove that C-approximation is possible for a compact, locally convex set C in a Riemannian manifold if (i) C has strictly convex boundary or if (ii) the sectional curvature is positive or negative on C.The proofs are based on a detailed analysis of the distance function from C, on results from [1] and on the Greene-Wu approximation process for convex functions ([5], [6]). Finally, using similar methods, a partial tubular neighborhood with geodesic fibres is constructed for the boundary of a locally convex set. This construction is essential for some results in [2]. 相似文献
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Attila Pethö 《Journal of Number Theory》1980,12(3):334-338
In this paper I prove the following Theorem: Let α be a quadratic irrational number and let ? > 0, . Then there exists an effectively computable, positive constant c depending on α and ? such that has no solutions in natural numbers q. 相似文献
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