16N20 06C05 2 16N99 2 16S99 2 lattice 2 preradical 2 quasi-co-$n$-absorbing 2 semi-co-$n$-absorbing 2 16S99; Secondary 06C05 1 Jacobson radical 1 Primary 16N99 1 Primary 16W10; Secondary 16D25 1 \(\Phi\)-Dedekind module 1 \(\Phi\)-\(TV\) module 1 \(\Phi\)-pseudo-Dedekind module 1 \(\Phi\)-sharp module 1 biideal 1 involution 1 local ring 1 nilpotent ring 1 subdirectly irreducible ring 1