Abstract
Cohomology appears as soon as one wishes to understand globally problems that one can solve locally. The cohomology will be a bookkeeping device for the obstructions preventing the existence of global solutions, provided that there are local solutions.
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A’Campo, N. (2021). Differential Topology of Surfaces. In: Topological, Differential and Conformal Geometry of Surfaces. Universitext. Springer, Cham. https://doi.org/10.1007/978-3-030-89032-2_5
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DOI: https://doi.org/10.1007/978-3-030-89032-2_5
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