Liu Jiang. Foreword[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 1989, 5(3): 1-2.
    Citation: Liu Jiang. Foreword[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 1989, 5(3): 1-2.
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    Foreword

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      • Abstract
    • If R is a ring in which finitely generated projective R-modules are free R-modules, then R is called a PF ring. It is well known that the polynomial rings over an PID are the PF rings. In this paper we obtained some properties of the PF rings, and gave some applications on the PF rings.
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