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Perturbation theory is an important tool to describe the properties of QCD atvery high temperatures. Recently a new technique has been proposed to computethe one-loop effective action of QCD at finite temperature by making a gaugecovariant derivative expansion, which is fully consistent with topologicallysmall and large gauge transformations (also time dependent transformations).This technique is based on the heat kernel expansion, and the thermal Wilsonline plays an essential role. We consider a general SU(N_c) gauge group.Comment: 3 pages, no figures. Proceedings for IX Hadron Physics and VII  Relativistic Aspects of Nuclear Physics, Angra dos Reis, Rio de Janeiro,  March 28 - April 03, 200

One-loop effective action of QCD at high temperature using the heat kernel method