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Degenerate Diffusion Operators Arising in Population Biology (AM-185)$
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Charles L. Epstein and Rafe Mazzeo

Print publication date: 2013

Print ISBN-13: 9780691157122

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691157122.001.0001

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The Resolvent Operator

The Resolvent Operator

(p.218) Chapter Eleven The Resolvent Operator
Degenerate Diffusion Operators Arising in Population Biology (AM-185)

Charles L. Epstein

Rafe1 Mazzeo

Princeton University Press

This chapter describes the construction of a resolvent operator using the Laplace transform of a parametrix for the heat kernel and a perturbative argument. In the equation (μ‎-L) R(μ‎) f = f, R(μ‎) is a right inverse for (μ‎-L). In Hölder spaces, these are the natural elliptic estimates for generalized Kimura diffusions. The chapter first constructs the resolvent kernel using an induction over the maximal codimension of bP, and proves various estimates on it, along with corresponding estimates for the solution operator for the homogeneous Cauchy problem. It then considers holomorphic semi-groups and uses contour integration to construct the solution to the heat equation, concluding with a discussion of Kimura diffusions where all coefficients have the same leading homogeneity.

Keywords:   resolvent operator, Laplace transform, heat kernel, generalized Kimura diffusion, homogeneous Cauchy problem, holomorphic semi-group, heat equation, Hölder space, solution operator, induction

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