Geodesic
Conjugately dense subgroups of free products of groups with amalgamation
Algebra i logika, Tome 45 (2006) no. 5, pp. 520-537.

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A subgroup having non-empty intersection with each class of conjugate elements of the group is said to be conjugately dense. It is shown that, under certain conditions, the number of conjugately dense subgroups in a free product with amalgamation is not less than some cardinal. As a consequence, P. Neumann's conjecture in the Kourovka notebook (Question 6.38) is refuted. It is also stated that a modular group and a non-Abelian group of countable or finite rank possess continuum many pairwise non-conjugate conjugately dense subgroups.
Keywords: linear group, free product with amalgamation, conjugately dense subgroup, field with discrete valuation. 
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S. A. Zyubin. Conjugately dense subgroups of free products of groups with amalgamation. Algebra i logika, Tome 45 (2006) no. 5, pp. 520-537. http://geodesic.mathdoc.fr/item/AL_2006_45_5_a1/

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