Geodesic
Local knotting of submanifolds
Sbornik. Mathematics, Tome 19 (1973) no. 2, pp. 166-176

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In this paper the author investigates the modification of the fundamental group of the complement of a submanifold of codimension 2 by knotting in a neighborhood of one of its points. With the aid of such knotting he constructs closed nonorientable surfaces in $\mathbf R^4$ with finite noncommutative groups. In the appendix he constructs a nontrivial knot such that, knotting by means of it does not change the type of the simplest imbedding $\mathbf RP^2\to\mathbf R^4$. Figures: 6. Bibliography: 10 titles. 
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     author = {O. Ya. Viro},
     title = {Local knotting of submanifolds},
     journal = {Sbornik. Mathematics},
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     number = {2},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_19_2_a1/}
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O. Ya. Viro. Local knotting of submanifolds. Sbornik. Mathematics, Tome 19 (1973) no. 2, pp. 166-176. http://geodesic.mathdoc.fr/item/SM_1973_19_2_a1/