Combinatorics of Curvature , and the Bianchi Identity

@inproceedings{Kock1996CombinatoricsOC,
  title={Combinatorics of Curvature , and the Bianchi Identity},
  author={Anders Kock},
  year={1996}
}
We analyze the Bianchi Identity as an instance of a basic fact of combinatorial groupoid theory, related to the Homotopy Addition Lemma. Here it becomes formulated in terms of 2-forms with values in the gauge group bundle of a groupoid, and leads in particular to the (Chern-Weil) construction of characteristic classes. The method is that of synthetic differential geometry, using “the first neighbourhood of the diagonal” of a manifold as its basic combinatorial structure. We introduce as a tool… CONTINUE READING

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