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https://ocw.nthu.edu.tw/chapter/226/2590 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第23講 Gauss-Bonnet Theorem for Simple Closed Curves and... 本於對開放教育資源運動的認同，清華大學自2008年6月起由課務組著手推動開放式課程。 gauss bonnet theorem closed curves nthu ocw simple https://indico.math.cnrs.fr/event/393/?view=event Scalar Curvature, Gauss-Bonnet Theorem and Einstein-Hilbert Action for Noncommutative Tori... Geometric spaces are described by spectral triples (A, H, D) in non-commutative geometry. In this context, A is an involutive noncommutative algebra... gauss bonnet theorem scalar curvature hilbert action einstein noncommutative