On intersection of two embedded spheres in 3-space

Details On intersection of two embedded spheres in 3-space On intersection of two embedded spheres in 3-space

2010-12-04

arxiv.org/abs/1012.0925v5

Mathematics

Geometric Topology

Russian version added; 13 pages, 8 figures

Scientific paper

We study intersection of two polyhedral spheres without self-intersections in 3-space. We find necessary and sufficient conditions on sequences x = x_1,x_2,...,x_n, y = y_1,y_2,...,y_n of positive integers, for existence of 2-dimensional polyhedra f,g in R^3 homeomorphic to the sphere and such that * f-g has n connected components, of which the i-th one has x_i neighbors in f and * g-f has n connected components, of which the i-th one has y_i neighbors in g. Analogously we study intersection of three polyhedral spheres without self-intersections in 3-space. Russian version is accessible to high-school teachers and students interested in mathematics.

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