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Published online by Cambridge University Press: 20 November 2018
Ziegler’s Indecomposability Criterion is used to prove that a totally transcendental, i.e., $\sum $-pure injective, indecomposable left module over a left noetherian ring is a directed union of finitely generated indecomposable modules. The same criterion is also used to give a sufficient condition for a pure injective indecomposable module
$_{R}U$ to have an indecomposable local dual
$U_{R}^{\#}.$