A domain is called an LPI domain if every locally principal ideal is invertible. It is proved in this note that if D is a LPI domain, then D[X] is also an LPI domain. This fact gives a positive answer to an open question put forward by D. D. Anderson and M. Zafrullah.
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Southwest Univ Sci & Technol, Coll Sci, Mianyang 621010, Peoples R ChinaSouthwest Univ Sci & Technol, Coll Sci, Mianyang 621010, Peoples R China
Hu, Kui
Wang, Fanggui
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Sichuan Normal Univ, Coll Math & Software Sci, Chengdu 610068, Peoples R ChinaSouthwest Univ Sci & Technol, Coll Sci, Mianyang 621010, Peoples R China
Wang, Fanggui
Xu, Longyu
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Southwest Univ Sci & Technol, Coll Sci, Mianyang 621010, Peoples R ChinaSouthwest Univ Sci & Technol, Coll Sci, Mianyang 621010, Peoples R China