Abstract
Given commuting elements a , b of a group G and a group epimorphism q : G ′ → G with finite kernel, the set of commuting lifts of a , b to G ′ is finite (possibly, empty). The second named author obtained a formula for the number of such lifts in terms of representations of Ker q. We apply this formula to several group epimorphisms q with the same kernel. In particular, we analyze the case where Ker q = Q 8 is the quaternion group. We show that in this case the number in question is equal to 0, 8, 16, 24, 40. We show that all these numbers are realized by some G , G ′ , q , a , b .
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