Abstract
This is a slightly expanded version of two lectures given at the Institute for Advanced Study of Princeton in the fall 1972. Some of this material was supposed to be included in a joint paper with R. Bott on smooth cohomology.
These notes do not contain any concrete new result. We just try to explain the philosophy of differentiable cohomology.
Namely one would like to compute the cohomology of classifying spaces Br of some topological groupoids T which plays an important role in the problem of constructing foliations (cf. [45]et[24] ). Unfortunetely this seems to be extremely difficult.
Now the classifying space BΓ(or rather the groupoïd ʓ) carry also a softer topology with some kind of differentiable structure. In the complex of cochains giving the cohomology of BΓ, one can single out the subcomplex of smooth cochains whose cohomology, called the differentiable or smooth cohomology of BΓ, is computed in many important cases, because it is isomorphic Go the cohomology of some Lie algebra associated to Γ. This is proved as the theorem of Van Est (cf. [12] ) relating the differentiable cohomology of a Lie group to the cohomology of its Lie algebra. The titel of this course could also have been : –Variations on a theorem of Van Est–.
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Haefliger, A. (2010). Differential Cohomology. In: Villani, V. (eds) Differential Topology. C.I.M.E. Summer Schools, vol 73. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11102-0_3
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