2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54374We present a brief overview of several approaches for calculating the local asymptotic expansion of the heat kernel for Laplace-type operators. The different methods developed in the papers of both authors some time ago are described in more detail.12 pages, Plain TeX, 35 KB, no figures, to appear in Proc. of 3rd Workshop `Quantum Field Theory under Influence of External Conditions', Leipzig, Sep. 18-22, 1995High Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext