This monograph is a unified presentation of several theories of finding explicit formulas for heat kernels for both elliptic and sub-elliptic operators. These k

Heat Kernels and Spectral Theory investigates the theory of second-order elliptic operators.

In the first edition of this book, simple proofs of the Atiyah-Singer Index Theorem for Dirac operators on compact Riemannian manifolds and its generalizations

This is the first comprehensive reference published on heat equations associated with non self-adjoint uniformly elliptic operators. The author provides introdu