Geodesic
Essential Cover and Closure
Serdica Mathematical Journal, Tome 30 (2004) no. 4, pp. 505-512 Cet article a éte moissonné depuis la source Bulgarian Digital Mathematics Library

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We construct some new examples showing that Heyman and Roos construction of the essential closure in the class of associative rings can terminate at any finite or the first infinite ordinal.
Keywords: Essential Extension, Essential Cover, Essential Closure, Accessible Subring 
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     author = {Andruszkiewicz, R.},
     title = {Essential {Cover} and {Closure}},
     journal = {Serdica Mathematical Journal},
     pages = {505--512},
     year = {2004},
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     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2004_30_4_a3/}
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Andruszkiewicz, R. Essential Cover and Closure. Serdica Mathematical Journal, Tome 30 (2004) no. 4, pp. 505-512. http://geodesic.mathdoc.fr/item/SMJ2_2004_30_4_a3/