Strongly cotorsion (torsion-free) modules and cotorsion pairs
Bull. Korean Math. Soc. 2010 Vol. 47, No. 5, 1041-1052
Published online September 1, 2010
Hangyu Yan
Nanjing University
Abstract : In this paper, strongly cotorsion (torsion-free) modules are studied and strongly cotorsion (torsion-free) dimension is introduced. It is shown that every module has a special $\mathcal{S}\mathcal{C}_n$-preenvelope and an $\mathcal{S}\mathcal{T}\mathcal{F}_n$-cover for any $n\in\mathbb{N}$ based on some results of cotorsion pairs from [9]. Some characterizations of strongly cotorsion (torsion-free) dimension of a module are given.
Keywords : strongly cotorsion module, strongly torsion-free module, cotorsion pair, strongly cotorsion dimension, strongly torsion-free dimension
MSC numbers : 16E30, 16E10
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