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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)

 

Defeat of the $ {\rm FP}\sp 2{\rm F}$ conjecture: Huckaba's example


Author: Carl Faith
Journal: Proc. Amer. Math. Soc. 116 (1992), 5-6
MSC: Primary 13B30; Secondary 13C11
MathSciNet review: 1097343
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Abstract: A commutative ring $ R$ is $ F{P^2}F$ (resp. FPF) provided that all finitely presented (resp. finitely generated) faithful modules generate the category $ \bmod - R$ of all $ R$-modules. A conjecture of the author dating to the middle 1970s states that any $ F{P^2}F$ ring $ R$ has FP-injective classical quotient ring $ Q = {Q_{cl}}(R)$. It was shown by the author (Injective quotient rings. II, Lecture Notes in Pure and Appl. Math., vol. 72, Dekker, New York, 1982, pp. 71-105) that FPF rings $ R$ have injective $ Q$ and by the author and P. Pillay (Classification of commutative FPF rings, Notas Math., vol. 4, Univ. de Murcia, Murcia, Spain, 1990) that $ CF{P^2}F$ local rings (defined below) have FP-injective $ Q$.

The counterexample is a difficult example due to Huckaba of a strongly Prüfer ring without "Property A." (A ring with Property A was labelled a McCoy ring by the author.)

This counterexample is $ CF{P^2}F$ in the sense that every factor ring of $ R$ is $ F{P^2}F$.


References [Enhancements On Off] (What's this?)

  • [Fl] Carl Faith, Injective quotient rings of commutative rings, Module theory (Proc. Special Session, Amer. Math. Soc., Univ. Washington, Seattle, Wash., 1977) Lecture Notes in Math., vol. 700, Springer, Berlin, 1979, pp. 151–203. MR 550435 (81a:13014)
  • [F2] -, Associated primes, annihilator ideals, and Kasch-McCoy commutative rings (in memory of Robert Warfield), Comm. Algebra 119 (1991).
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  • [FP] Carl Faith and Poobhalan Pillay, Classification of commutative FPF rings, Notas de Matemática [Mathematical Notes], vol. 4, Universidad de Murcia, Secretariado de Publicaciones e Intercambio Científico, Murcia, 1990. MR 1091714 (92k:13012)
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Additional Information

DOI: http://dx.doi.org/10.1090/S0002-9939-1992-1097343-3
PII: S 0002-9939(1992)1097343-3
Article copyright: © Copyright 1992 American Mathematical Society