On hereditary rings and the pure semisimplicity conjecture II: Sporadic potential counterexamples
$\hskip -1pt$It was shown in [Colloq. Math. 135 (2014), 227–262] that the pure semisimplicity conjecture (briefly, pssC) can be split into two parts: first, a weak pssC that can be seen as a purely linear algebra condition, related to an embedding of division rings and properties of matrices over those rings; the second part is the assertion that the class of left pure semisimple sporadic rings (ibid.) is empty. In the present article, we characterize the class of left pure semisimple sporadic rings having finitely many Auslander–Reiten components; the characterization is given through properties of the defining bimodules and the sequences of dimensions associated to these bimodules.