The number of indecomposable Schur rings over a cyclic 2-group.
Invertibility-preserving maps of -algebras with real rank zero.
Automorphism groups of Cayley digraphs of .
Schauder bases in an abstract setting.
Characterizations of effective sets and nonexpansive multipliers in conditionally complete and infinitely distributive partially ordered sets.
On perfect numbers connected with the composition of arithmetic functions.
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