The von Neumann-Morgenstern stable sets for 2x2 games

We analyze the von Neumann and Morgenstern stable sets for the mixed extension of 2 2 games when only single profitable deviations are allowed. We show that the games without a strict Nash equilibrium have a unique vN&M stable set and otherwise they have infinite sets.

von Neumann spin measurements with Rashba fields

We show that dynamics in the spin-orbit coupling field simulate the von Neumann measurement of a particle spin. We demonstrate how the measurement influences the spin and coordinate evolution of a particle by comparing two examples of such a procedure. The first example is a simultaneous measurement of spin components, sigma(x) and sigma(y), corresponding to non-commuting operators, which cannot be accurately obtained together at a given time instant due to the Heisenberg uncertainty ratio. By mapping spin dynamics onto a spatial walk, such a procedure determines measurement-time averages of sigma(x) and sigma(y), which can already be precisely evaluated in a single short-time measurement. The other, qualitatively different, example is the spin of a one-dimensional particle in a magnetic field. Here, the measurement outcome depends on the angle between the spin-orbit coupling and magnetic fields. These results can be applied to studies of spin-orbit coupled cold atoms and electrons in solids.

Admissible Hierachic Sets

In this paper we present a solution concept for abstract systems called the admissible hierarchic set. The solution we propose is a refinement of the hierarchic solution, a generalization of the von Neumann and Morgenstern solution. For finite abstract systems we show that the admissible hierarchic sets and the von Neumann and Morgenstern stable sets are the only outcomes of a coalition formation procedure (Wilson, 1972 and Roth, 1984). For coalitional games we prove that the core is either a vN&M stable set or an admissible hierarchic set.

The Supercore for Normal Form Games

We study the supercore of a system derived from a normal form game. For the case of a finite game with pure strategies, we define a sequence of games and show that the supercore of that system coincides with the set of Nash equilibrium strategy profiles of the last game in the sequence. This result is illustrated with the characterization of the supercore for the n-person prisoners’ dilemma. With regard to the mixed extension of a normal form game, we show that the set of Nash equilibrium profiles coincides with the supercore for games with a finite number of Nash equilibria. For games with an infinite number of Nash equilibria this need not be no longer the case. Yet, it is not difficult to find a binary relation which guarantees the coincidence of these two sets.

La aportación de W. von Humboldt a la gramática vasca

[EN] The aim of this paper is to introduce the main contributions of Humboldt to the study of the Basque grammar. His methodological innovations and the influence he had on european linguists are pointed out, the grammatical sources available to him are mentioned and his woks on Basque grammar are enumerated. Some of Humboldt's most interesting analysis are mentioned and are placed in the former and later tradition of the Basque grammar.

Materiales vascos del legado de Wilhelm von Humboldt: la relevancia de Astarloa y el Plan de Lenguas

Este artículo es traducción del original alemán «Zum Stellenwert Astarloas und des Plan de Lenguas», publicado en B. Hurch (ed.), Die baskischen Materialien aus dem Nachlaß Wilhelm von Humboldts. Astarloa, Charpentier, Fréret, Aizpitarte und anderes. Paderborn: Schöningh, pp. 21-42. La traducción al español es obra de Oroitz Jauregi y ha sido revisada por Ricardo Gómez y Bernhard Hurch.

El viajero Wilhelm von Humboldt y sus sucesores: caracterización cultural del País Vasco en las descripciones de viaje del siglo XIX

Berta Raposo Fernández e Ingrid García Wistädt (editoras)

La traducción vista desde la perspectiva del concepto de "literatura universal" de Johann Wolfgang von Goethe (1749-1832)

Eguíluz, Federico; Merino, Raquel; Olsen, Vickie; Pajares, Eterio; Santamaría, José Miguel (eds.)

Helduen altuera iragarpena: belaunerainoko altuera neurriak

[EUS] Lan honen helburua ohiko metodoen zein metodo ez-zuzenekoen bitartez (belaunerainoko altuera antropometroarekin eta zinta metrikoarekin) pertsona helduez osaturiko talde baten altuera zehaztea izan da. Ez-zuzeneko altuera zehaztapenek komunztadura altua erakutsi zuten benetako altuerarekin. Zinta metrikoaren bitartez neurturiko belaunerainoko altuerak komunztadura altuagoa erakutsi zuen benetako altuerarekin, antropometroaren bitartez definiturikoa baino.