Geometric aspects of the filtration on classical links by k-quasi-isotopy are discussed, including the effect of Whitehead doubling, relations with Smythe's n-splitting and Kobayashi's k-contractibility. One observation is: ω-quasi-isotopy is equivalent to PL isotopy for links in a homotopy 3-sphere (resp. contractible open 3-manifold) M if and only if M is homeomorphic to S 3 (resp. R 3). As a...

Bimetallic surfaces allow tailoring their catalytic activity by modifying composition and/or structure. However, under operating conditions, catalytically active bimetallic structures are often not stable and change morphology which might reduce functionality. Still, do necessarily need to be thermodynamically also kinetically stabilized. Here we report kinetic Monte Carlo simulations based on ...

In this paper, we investigate approximation of quasi-projection operators in Besov spaces B p,q, μ > 0, 1 ≤ p, q ≤ ∞. Suppose I is a countable index set. Let (φi)i∈I be a family of functions in Lp(IR), and let (φ̃i)i∈I be a family of functions in Lp̃(IR), where 1/p+ 1/p̃ = 1. Let Q be the quasi-projection operator given by

the title compound has been synthesized starting from 2-methoxybenzdiethylarnide (1).

The notions of directed distances, quasi-metrics and oriented multi-cuts are generalizations of the notions of distances, metrics and cuts, which are central objects in graph theory and combinatorial optimization. Define a quasi-semi-metric on X as a function d from X2 to R+, such that for all x, y, z ∈ X , d(x, y) ≥ 0, d(x, x) = 0, and d(x, y) ≤ d(x, z) + d(z, y). If the first inequality is st...

Ten years ago, Abramsky, Jagadeesan, Malacaria (AJM) introduced a fully abstract game model of PCF, inspired by Girard’s Geometry of Interaction. The key ingredient of the model is a partial equivalence relation (per) on strategies, which captures the idea of a strategy “blind to the Opponent’s thread indexing”. We reveal the group-theoretic nature of this construction, and reformulate arena ga...