20C07 20F24 6 16S34 5 20D10 4 Chernikov groups 4 20C05 3 20N15 3 20-00 2 20B07 2 20E07 2 20E15 2 20E25 2 20E26 2 20E28 2 20E34,20E36 2 20E45 2 20F14 2 20F16 2 20F18 2 20F19 2 20F22 2 20F50 2 CC – groups 2 Dietzmann classes 2 FC – groups 2 Kaplansky conjecture 2 Kaplansky’s Direct Finiteness Conjecture 2 anti-\(\mathfrak{X}C\)-groups 2 artinian modules 2 decompositions 2