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.