Geodesic
On natural and conatural sets of left ideals of a~ring
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2007), pp. 25-32.

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The natural and conatural sets of left ideals of a ring R are defined by analogy with natural and conatural classes of left R-modules [4,5]. Some characterizations and properties of such sets are indicated. The lattices of natural sets R-Nat and of conatural sets R-Conat of R are treated as skeletons of more wide lattices of closed and coclosed sets. In particular, R-Nat and R-Conat are boolean lattices. 
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A. I. Kashu. On natural and conatural sets of left ideals of a~ring. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2007), pp. 25-32. https://geodesic-test.mathdoc.fr/item/BASM_2007_2_a2/

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