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math.CA2016
Intrinsic Lipschitz graphs and vertical -numbers in the Heisenberg group
Vasileios Chousionis, Katrin Fässler, Tuomas Orponen
The purpose of this paper is to introduce and study some basic concepts of quantitative rectifiability in the first Heisenberg group . In particular, we aim to demonstr…
math.CA2016
Curve packing and modulus estimates
Katrin Fässler, Tuomas Orponen
A family of planar curves is called a Moser family if it contains an isometric copy of every rectifiable curve in of length one. The classical "worm problem" of L.…