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Box splines and the equivariant index theorem

Part of: Topological $K$-theory Numerical approximation and computational geometry $K$-theory and operator algebras

Published online by Cambridge University Press:  01 June 2012

C. De Concini ,
C. Procesi  and
M. Vergne
C. De Concini
Affiliation:
Dipartimento di Matematica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italia
C. Procesi
Affiliation:
Dipartimento di Matematica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italia
M. Vergne
Affiliation:
Institut de Mathématiques de Jussieu, 175 rue du Chevaleret, 75013 Paris, France ([email protected])
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Abstract

In this article, we begin by recalling the inversion formula for the convolution with the box spline. The equivariant cohomology and the equivariant $K$-theory with respect to a compact torus $G$ of various spaces associated to a linear action of $G$ in a vector space $M$ can both be described using some vector spaces of distributions, on the dual of the group $G$ or on the dual of its Lie algebra $\mathfrak{g}$. The morphism from $K$-theory to cohomology is analyzed, and multiplication by the Todd class is shown to correspond to the operator (deconvolution) inverting the semi-discrete convolution with a box spline. Finally, the multiplicities of the index of a $G$-transversally elliptic operator on $M$ are determined using the infinitesimal index of the symbol.

Keywords

splinesbox splinesdeconvolutionindex theoryequivariant K-theoryequivariant cohomologyRiemann–Rochelliptic operators

MSC classification

Secondary: 65D07: Splines 19L10: Riemann-Roch theorems, Chern characters 19L47: Equivariant $K$-theory 19K56: Index theory
Type
Research Article
Information
Journal of the Institute of Mathematics of Jussieu , Volume 12 , Issue 3 , July 2013 , pp. 503 - 544
Copyright
©Cambridge University Press 2012 

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