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Electromagnetic reciprocity is studied in the presence of topological insulators (TI)with application of axion electrodynamics for harmonic electromagnetic fields. The corresponding generalized Lorentz and Feld-Tai type lemmas are derived in terms of the axion coupling parameter, and their correlation to the conditional symmetry in source-observer coordinates for the variousGreen dyadics is established subjected to different types of boundary conditions. Possible application of the results to the probing of the topologicalmagneto-electric effects fromTI is discussed.

Electromagnetic reciprocity in the presence of topological insulators