Geodesic
Subalgebras of finite codimension
Matematičeskie zametki, Tome 6 (1969) no. 3, pp. 321-328 
E. A. Gorin. Subalgebras of finite codimension. Matematičeskie zametki, Tome 6 (1969) no. 3, pp. 321-328. http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a8/
@article{MZM_1969_6_3_a8,
     author = {E. A. Gorin},
     title = {Subalgebras of finite codimension},
     journal = {Matemati\v{c}eskie zametki},
     pages = {321--328},
     year = {1969},
     volume = {6},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a8/}
}
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JO  - Matematičeskie zametki
PY  - 1969
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EP  - 328
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IS  - 3
UR  - http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a8/
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ID  - MZM_1969_6_3_a8
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%G ru
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Voir la notice de l'article provenant de la source Math-Net.Ru

We consider a commutative algebra $A$ over a field $K$ whose algebraic closure is a finite extension of $K$, and describe the subalgebras of $A$ that are of finite codimension. We solve a similar problem for the closed subalgebras of Banach algebras