2 papers
math.GT2018
Counting fixed points free vector fields on
Simeon T. Stefanov
The number of diagrams of stationary points free vector fields in the 2-disk is counted in the article. It is shown that the number of such diagrams with exce…
math.GT2017
Ribbon invariants I
Simeon Stefanov
A non-negative integer invariant, estimating from below the number of geometrically different critical points of a smooth function defined in the 2-disk, $f:\mathbb{B}^{2}\righ…