The goal of the work is to research case isotopy spacecraft compartments in problem on-board equipment location. A definition this engineering topological property given article. most frequently used compartment hull shapes and various compositions their casings are considered. Also, general strategies taking decisions that determine choice modeling technologies performance factors discussed. m...

We construct a link in the 3 3 -space that is not isotopic to any PL (non-ambiently). In fact, we show there exist uncountably many alttext="u...

We classify up to isotopy the tight contact structures on small Seifert spaces with e0 6= 0,−1,−2.

We classify positive transversal torus knots in tight contact structures up to transversal isotopy.