We study the evolution of cooperation under indirect reciprocity, believed to constitute the biological basis of morality. We employ an evolutionary game theoretical model of multilevel selection, and show that natural selection and mutation lead to the emergence of a robust and simple social norm, which we call stern-judging. Under stern-judging, helping a good individual or refusing help to a...

The motion of neutral particles with magnetic moments in an inhomoge-neous magnetic field is described in a semi-classical framework. The concept of Coherent Internal States is used in the formulation of the semiclassical approximation from the full quantum mechanical expression. The classical trajectories are defined only for certain spin states, that satisfy the conditions for being Coherent ...

The problem of finding the minimum-energy configuration of particles on a lattice, subject to a generic short-ranged repulsive interaction, is studied analytically. The study is relevant to charge ordered states of interacting fermions, as described by the spinless Falicov–Kimball model. For a range of particle density including the half-filled case, it is shown that the minimum-energy states c...

This paper presents new results about digital straight segments, their recognition and related properties. They come from the study of the arithmetically based recognition algorithm proposed by I. Debled-Rennesson and J.-P. Reveillès in 1995 [4]. We indeed exhibit the relations describing the possible changes in the parameters of the digital straight segment under investigation. This descriptio...

A G-equivariant spinc structure on a manifold gives rise to a virtual representation of the group G, called the spinc quantization of the manifold. We present a cutting construction for S-equivariant spinc manifolds, and show that the quantization of the original manifold is isomorphic to the direct sum of the quantizations of the cut spaces. Our proof uses Kostanttype formulas, which express t...

We derive an algorithm that enables the rationals to be efficiently enumerated in two different ways. One way is known and is credited to Moshe Newman; it corresponds to a deforestation of the so-called Calkin-Wilf tree of rationals. The second is new and corresponds to a deforestation of the Stern-Brocot tree of rationals. We show that both enumerations stem from the same simple algorithm. In ...

Experiments on side-setting methods were conducted in April-May 2006 using a large-sized longline research vessel (total length 54 m, 450 GT) to examine the applicability of side setting to large distant-water-type Japanese longline vessels. Two sets of line setting equipment were installed at the end and side of the stern deck, and the performances of stern setting and side setting were compar...

http://dx.doi.org/10.1016/j.jseaes.2015.05.019 1367-9120/ 2015 Elsevier Ltd. All rights reserved. ⇑ Corresponding author. Tel.: +98 5138218146, mobile: +98 9155011318; fax: +98 5138212402. E-mail addresses: [email protected] (R.M. Bagherzadeh), [email protected] (M.H. Karimpour), [email protected] (G.L. Farmer), [email protected] (C.R. Stern), [email protected] (J.F. Santos)...

Jonathan M. Stern is Chair of the DRI Aerospace Law Committee. He practices aerospace and insurance coverage law with Schnader Harrison Segal & Lewis LLP, where he is resident in the Firm’s Washington, DC, office. Mr. Stern, who holds FAA-issued commercial pilot, control tower operator, and ground instructor certificates, was formerly an air traffic controller at Washington National Airport and...