The main ingredients of the cohomological formula for the Fredholm index of non-local elliptic operators are the Г-Todd class of the complexified cotangent bundle of the manifold M and the Chern character of the symbol. (Both are collections of cohomology classes defined on cotangent bundles of fixed-point manifolds M g of the action of Г.) In this chapter, we describe the Chern character.
KeywordsCohomology Class Cotangent Bundle Chern Character Fredholm Index Cyclic Invariance
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