Geodesic
Properties of accessible subrings of topological rings when taking quotient rings
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2007), pp. 4-18

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A continuous isomorphism of topological rings is a superposition of a finite number of semi-topological isomorphisms if and only if it is a narrowing on an accessible subring of some topological homomorphism. 
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     author = {V. I. Arnautov},
     title = {Properties of accessible subrings of topological rings when taking quotient rings},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {4--18},
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     year = {2007},
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V. I. Arnautov. Properties of accessible subrings of topological rings when taking quotient rings. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2007), pp. 4-18. http://geodesic.mathdoc.fr/item/BASM_2007_2_a0/