Abstract
Enochs' proof of the Flat Cover Conjecture [BEE] is based on a construction of special preenvelopes from [ET1]. A recent result of Eklof and Shelah [ES] implies consistency (with ZFC + GCH) of non-existence of the dual construction of special precovers, for certain abelian groups. By an analysis of Ext on limits of well-ordered inverse systems, we prove that a weaker form of the dual construction is still available (in ZFC), for any module over any ring.
Citation
Jan Trlifaj. "Ext and inverse limits." Illinois J. Math. 47 (1-2) 529 - 538, Spring/Summer 2003. https://doi.org/10.1215/ijm/1258488170
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