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ANOTHER CRITERION FOR A RING TO BE PROJECTIVE-FREE

Published online by Cambridge University Press:  12 December 2005

P. M. COHN
P. M. COHN
Affiliation:
Department of Mathematics, University College London, Gower Street, London WC1IE 6BT, United Kingdom
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Abstract

It is proved that a ring (≠0) is projective-free precisely when it has invariant basis number and every idempotent matrix not equal to I is non-full.

Keywords

16D40
Type
Papers
Information
Bulletin of the London Mathematical Society , Volume 37 , Issue 6 , December 2005 , pp. 857 - 859
Copyright
© The London Mathematical Society 2005

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