A regular ring embeddable in any right ideal
Tài liệu tham khảo
K. R. Goodearl, Von Neumann Regular Rings, Pitman, London (1979).
L. A. Skornyakov, Complemented Dedekind Lattices and Regular Rings [in Russian], Gos. Izd.-vo Fiz.-Mat. Lit., Moscow (1961).