Regular ArticleCovers Induced by Ext☆,☆☆
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Keywords
precover
cover
right approximation
Ext
Tor
pure-injective module
Dedekind domain
axiom of constructibility
flat cover conjecture
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Research partially supported by grants NSF DMS 98-03126, GAČR 201/97/1162, and MSM: 113200007
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Communicated by Kent, Fuller
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