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20 papers · 1 filter
On additive complement of a finite set
Sándor Z. Kiss, Eszter Rozgonyi, Csaba Sándor
We say the sets of nonnegative integers A and B are additive complements if their sum contains all sufficiently large integers. In this paper we prove a conjecture of Chen and Fang…
Effect of stacking faults on the magnetocrystalline anisotropy of hcp Co: a first-principles study
C J Aas, L Szunyogh, R F L Evans +1
In terms of the fully relativistic screened Korringa-Kohn-Rostoker method we investigate the effect of stacking faults on the magnetic properties of hexagonal close-packed cobalt.…
Coverings by few monochromatic pieces - a transition between two Ramsey problems
András Gyárfás, Gábor N. Sárközy, Stanley Selkow
The typical problem in (generalized) Ramsey theory is to find the order of the largest monochromatic member of a family F (for example matchings, paths, cycles, connected subgraphs…
Topical Issue in Solar Physics: Flux-rope Structure of Coronal Mass Ejections Preface
N. Gopalswamy, T. Nieves-Chinchilla, M. Hidalgo +4
This Topical Issue of Solar Physics, devoted to the study of flux-rope structure in coronal mass ejections (CMEs), is based on two Coordinated Data Analysis Workshops (CDAWs) held…
2013 Unit Vectors in the Plane
Imre Barany, Boris D. Ginzburg, Victor S. Grinberg
Given a norm on the plane and 2013 unit vectors in this norm, there is a signed sum of these vectors whose norm is at most one.
A compact radio source in the high-redshift soft gamma-ray blazar IGR J12319-0749
S. Frey, Z. Paragi, K. E. Gabanyi +1
Context. Blazars are powerful active galactic nuclei (AGNs) radiating prominently in the whole electromagnetic spectrum, from the radio to the X-ray and gamma-ray bands. Their emis…