2 papers
math.SG2026
A contact-geometric variant of Smale's contraction
Florian Buck, Christopher Schmidt, Kai Zehmisch
Motivated by Smale's contraction of the compactly supported diffeomorphism group of the two-disc, we study contact forms on an open rotationally symmetric Darboux ball that agree w…
math.SG2025
Connected sums of Brieskorn contact -spheres
Florian Buck, Kai Zehmisch
In dimension , the contact connected sum of Brieskorn contact spheres is, in general, not a Brieskorn contact sphere.