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The dimension of any module over an algebra of affiliated operators U of a finite von Neumann algebra A is defined using a trace on A. All zero-dimensional U -modules constitute the torsion class of torsion theory (T, P). We show that every finitely generated U -module splits as the direct sum of torsion and torsion-free part. Moreover, we prove that the theory (T, P) coincides with the theory of bounded and unbounded modules and also with the Lambek and Goldie torsion theories. Lastly, we usedoi:10.1216/rmjm/1199649837 fatcat:kavt7dxmtrg55p5gxauawpph24