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connection_curvature_chern_classes.pdf

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Math230a (Fall 2025) Yum-Tong Siu 1 Connection and Curvature of Vector Bundle and Chern Classes §1. Differentiation of Sections of Vector Bundle to Get Sections We start out with a vector bundle V of rank r over a smooth manifold X, which is defined by transition functions Gj,k with respect to a covering {Uj } of X. A section σ over an open subset U is given by {σj } so that σj is an r-tuple of functions over U ∩ Uj and σj = Gj,k σk . Here no summation is used and σj , σk are column vectors and Gj,k is an r × r matrix. For our…

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