Integrals of Equivariant forms and a Gauss-Bonnet Theorem for Constructible Sheaves

The classical integral localization formula for equivariantly closed forms (Theorem 7.11 in [BGV]) is well-known and requires the acting Lie group to be compact. It is restated here as Theorem 2. In this article we extend this result to NONcompact groups. The main result is Theorem 20. Then, using this generalization, we prove an analogue of the Gauss-Bonnet theorem for constructible sheaves (Theorem 43). These results can be used to obtain a generalization of the Riemann-Roch-Hirzebruch integral formula.