Acta mathematica scientia, Series B >
ON ALMOST PRECOVERS AND ALMOST PREENVELOPES
Received date: 2003-05-26
Revised date: 1900-01-01
Online published: 2006-07-20
Let C be a class of R-modules closed under isomorphisms and finite direct sums. It is first shown that the finite direct sum of almost C-precovers is an almost C-precover and the direct sum of an almost C-cover and a weak C-cover is a weak C-cover. Then the notion of almost C-preenvelopes is introduced and studied.
Key words： Almost precover; almost preenvelope
Mao Lixin , Ding Nanqing , Tong Wenting . ON ALMOST PRECOVERS AND ALMOST PREENVELOPES[J]. Acta mathematica scientia, Series B, 2006 , 26(3) : 395 -400 . DOI: 10.1016/S0252-9602(06)60062-3
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