The duality between projective modules and injective modules, also the duality between divisible abelian groups and free abelian groups.
|
1 | [made Community Wiki] | ||
|
|
||||
|
|
1 | [made Community Wiki] | ||
|
The duality between projective modules and injective modules, also the duality between divisible abelian groups and free abelian groups. |
||||
