A Non-Hausdorff de Rham Cohomology
Abstract
In this paper we introduce and study the basic properties of de Rham cohomology for a certain class of non-Hausdorff manifolds. After a careful discussion of non-Hausdorff differential forms, we provide a description of de Rham cohomology via Mayer-Vietoris sequences. We then use these sequences to prove both de Rham's Theorem and the Gauss-Bonnet theorem for our non-Hausdorff manifolds. Regarding the latter, we will see that the desired equality requires additional counterterms coming from the geodesic curvature of certain Hausdorff-violating submanifolds.
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