Titlebook: Unpublished Manuscripts; from 1951 to 2007 Lars H?rmander Book 2018 Springer International Publishing AG, part of Springer Nature 2018 Anal

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The Cosine Theorem On A Surface And The Notion Of Curvature,ever, the nature of this influence is seldom spelled out. This is unfortunate, for the work of Gauss seems extremely natural if one knows a theorem of Legendre on spherical triangles which was familiar to contemporary geodesists.