HOW TO MAKE Ext VANISH

PAUL C. EKLOF; JAN TRLIFAJ

doi:10.1112/blms/33.1.41

Abstract

We describe a general construction of a module A from a given module B such that Ext(B, A) = 0, and we apply it to answer several questions on splitters, cotorsion theories and saturated rings.

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HOW TO MAKE Ext VANISH

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