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On Semi-Primary Self-Injective Rings and Faith's Quasi-Frobenius Conjecture

Part of: Modules, bimodules and ideals Local rings and generalizations

Published online by Cambridge University Press:  10 December 2014

M. C. Iovanov
M. C. Iovanov*
Affiliation:
Department of Mathematics, University of Iowa, 14 MacLean Hall, Iowa City, Iowa 52242-1419, USA, ([email protected]) Facultatea de Matematica, University of Bucharest, Str. Academiei 14, Sector 1, Bucharest 010014, Romania
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Abstract

A long-standing conjecture of Faith in ring theory states that a left self-injective semi-primary ring A is necessarily a quasi-Frobenius ring. We propose a new method for approaching this conjecture, and prove it under some mild conditions; we show that if the simple A-modules are at most countably generated over a subring of the centre of A, then the conjecture holds. Also, the conjecture holds for algebras A over sufficiently large fields, i.e. if the cardinality of is larger than the dimension of the simple A-modules (or of A/Jac(A)). This effectively proves the conjecture in many situations, and we obtain several previously known results on this problem as a consequence.

Keywords

quasi-Frobenius ringsQF ringsFaith conjectureself-injective ring

MSC classification

Primary: 16D50: Injective modules, self-injective rings 16L60: Quasi-Frobenius rings
Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 58 , Issue 1 , February 2015 , pp. 219 - 229
Copyright
Copyright © Edinburgh Mathematical Society 2015 

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