formation 20D10 8 20F17 6 finite group 6 формування 3 13E10 2 20F19 2 Boolean lattice 2 FEMM program 2 Finite group 2 Lua script 2 Lua скрипт 2 S-quasinormal 2 \(Qf\)-central element 2 \(\tau\)-closed \(n\)-multiply \(\omega\)-composition formation 2 \(\tau\)-closed formation 2 artinian modules 2 complement 2 complemented lattice 2 direct decomposition 2 electric machines 2 graphical and physical models 2 lattice of formations 2 magnetic field 2 modules over group rings 2 supplement 2 totally saturated formation 2 геометрична і фізична моделі 2 електричні машини 2 магнітне поле 2