Immersions of Graphs into Projective Plane. / M. A. Ivashkovskii. // Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika. 2017. № 5. P. 61-65 [Moscow Univ. Math. Bulletin. Vol. 72, N 2, 2017. P. 217-220].

Immersions of graphs into the projective plane are studied. A classification of immersions up to a regular homotopy is obtained. A complete invariant of immersions up to a regular homotopy is constructed. The case of immersions of graphs into any compact surface differing from the projective plane was known previously.

Key words: regular immersion of a graph, regular homotopy of immersions, Reidemeister moves, self-intersection number.

№ 5/2017