11 citations · 23 across the 20 of their papers we have counts for
21 papers
Torsion in asymptotic cones of free groups
Jarek Kędra, Assaf Libman, Zipei Nie
We prove that the asymptotic cone of any non-abelian free group equipped with the bi-invariant word metric has elements of order 2.
Are free groups of different ranks bi-invariantly quasi-isometric?
Jarek Kędra, Assaf Libman
We prove that a homomorphism between free groups of finite rank equipped with the bi-invariant word metrics is a quasi-isometry if and only if it is an isomorphism.
Abstract Weighted Based Gradual Semantics in Argumentation Theory
Assaf Libman, Nir Oren, Bruno Yun
Weighted gradual semantics provide an acceptability degree to each argument representing the strength of the argument, computed based on factors including background evidence for t…
The complex of injective words of permutations which are not derangements is contractible
Assaf Libman
Let be the set of derangements in the symmetric group. We prove that the complex of injective words generated by is contractible. This gives…
European baskets in discrete-time continuous-binomial market models
Jarek Kędra, Assaf Libman, Victoria Steblovskaya
We consider a discrete-time incomplete multi-asset market model with continuous price jumps. For a wide class of contingent claims, including European basket call options, we compu…
Minimum Cost Super-Hedging in a Discrete Time Incomplete Multi-Asset Binomial Market
Jarek Kędra, Assaf Libman, Victoria Steblovskaya
We consider a multi-asset incomplete model of the financial market, where each of risky assets follows the binomial dynamics, and no assumptions are made on the joint dis…