The existence of the Gorenstein projective precovers over arbitrary rings is an open question. It is known that if the ring has finite Gorenstein global dimension, then every module has a Gorenstein projective precover. We prove here a "reduction" property - we show that, over any ring, it suffices to consider finitely presented modules: if there exists a nonnegative integer n such that every finitely presented module has Gorenstein projective dimension <= n, then the class of Gorenstein projective modules is special precovering.
机构:
Chongqing Normal Univ, Sch Math Sci, Chongqing 401331, Peoples R China
Fudan Univ, Sch Math Sci, Shanghai 200433, Peoples R ChinaChongqing Normal Univ, Sch Math Sci, Chongqing 401331, Peoples R China