Geodesic
On the sense preserving mappings in the Helm topology in the plane
Serdica Mathematical Journal, Tome 25 (1999) no. 1, pp. 41-46

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We introduce the helm topology in the plane. We show that (assuming the helm local injectivity and the Euclidean continuity) each mapping which is oriented at all points of a helm domain U is oriented at U.
Keywords: Fine Topology, Density Topology 
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Pyrih, Pavel. On the sense preserving mappings in the Helm topology in the plane. Serdica Mathematical Journal, Tome 25 (1999) no. 1, pp. 41-46. http://geodesic.mathdoc.fr/item/SMJ2_1999_25_1_a4/