An elementary proof of Noble's theorem on normality of powers
Commentationes Mathematicae Universitatis Carolinae, Tome 29 (1988) no. 4, pp. 677-678.

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Classification : 54B10, 54D15, 54D30
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     title = {An elementary proof of {Noble's} theorem on normality of powers},
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Engelking, Ryszard. An elementary proof of Noble's theorem on normality of powers. Commentationes Mathematicae Universitatis Carolinae, Tome 29 (1988) no. 4, pp. 677-678. http://geodesic.mathdoc.fr/item/CMUC_1988__29_4_a5/