24 citations · 117 across the 105 of their papers we have counts for
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George M. Bergman, Saharon Shelah
Let S=Sym(Ω) be the group of all permutations of a countably infinite set Ω, and for subgroups G_1, G_2\leq S let us write G_1\approx G_2 if there exists a finite set U\subseteq S…