Noncommutative residue

From HandWiki

In mathematics, noncommutative residue, defined independently by M. (Wodzicki 1984) and (Guillemin 1985), is a certain trace on the algebra of pseudodifferential operators on a compact differentiable manifold that is expressed via a local density. In the case of the circle, the noncommutative residue had been studied earlier by M. (Adler 1978) and Y. (Manin 1978) in the context of one-dimensional integrable systems.

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