In this note, we shall give an averaging formula for Reidemeister traces, which is a simple relation among Reidemeister traces of a selfmap and those of its liftings with respect to a finite-fold regular covering.2010 Mathematics Subject Classification. 55M20. Key words and phrases. Averaging formula, Reidemeister trace, self-map, lifting, regular covering.This work is supported by the NSF of China (11431009) and a project of Beijing Municipal Education Commission (KZ201310028030).

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