Geodesic
Subgroup Separability and Conjugacy Separability of Certain HNN Extensions
Bulletin of the Malaysian Mathematical Society, Tome 31 (2008) no. 1
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In this note, we give characterizations for certain HNN extensions of polycyclic-by-finite groups with central associated subgroups to be subgroup separable and conjugacy separable. We shall do this by showing the equivalence of subgroup separability and conjugacy separability in this type of HNN extensions.
Classification : Primary 20E06, 20E26; Secondary 20F10, 20F19. 
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     author = {P. C. Wong and K. B. Wong},
     title = {Subgroup {Separability} and {Conjugacy} {Separability} of {Certain
}                            {HNN} {Extensions}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2008},
     volume = {31},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2008_31_1_a2/}
}
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P. C. Wong; K. B. Wong. Subgroup Separability and Conjugacy Separability of Certain
                            HNN Extensions. Bulletin of the Malaysian Mathematical Society, Tome 31 (2008) no. 1. http://geodesic.mathdoc.fr/item/BMMS_2008_31_1_a2/