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5.22 (1976)

Solved

Does there exist a version of the Higman embedding theorem in which the degree of unsolvability of the conjugacy problem is preserved?

Contributor: D. J. Collins

Progress

Yes, there does (A. Yu. Olshanskii, M. V. Sapir, The conjugacy problem and Higman embeddings (Memoirs AMS, 804), 2004, 133 p.).

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