EXTENSIONS OF ELEMENTARY DUALITY

[摘要] Elementary duality of pp-formulas for modules is extended to certain infinitary formulas and theories. Examples are given indicating the limits of such an extension. Some applications to absolutely pure and flat modules are made. Also considered are the extension of elementary duality to abelian structures and the relationship of elementary duality defined on categories of finitely presented functors from finitely presented modules to abelian groups.

[发布日期] 1994-04-11