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In [1], S. S. Chern gave a very elegant and simple proof of the Gauss-Bonnet formula for closed (i.e. compact without boundary) oriented Riemannian manifolds of even dimension:Here, c is a suitable constant depending on the dimension of M and Ω is an n-form (n = dim M) which may be calculated from its curvature tensor. W. Greub gave a coordinate-free description of this integrand Ω (cf. [4]).
Local Riemannian geometry, Characteristic classes and numbers in differential topology, Integral geometry
Local Riemannian geometry, Characteristic classes and numbers in differential topology, Integral geometry
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