Créditos desta edição | v. 5, n. 7, (2010)

$n$-cocoherent rings‎, ‎$n$-cosemihereditary rings and $n$-V-rings

 Let $R$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎A right $R$-module $M$ is called $(n‎, ‎d)$-projective if $Ext^{d+1}_R(M‎, ‎A)=0$ for every $n$-copresented right $R$-module $A$‎. ‎$R$ is called right $n$-cocoherent if every $n$-copresented right $R$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $R$-module is $(n‎, ‎d)$-projective‎. ‎$R$...

Conference Tuesday 5 th October – Thursday 7 th October 2010

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v 1 5 N ov 1 99 7 TWO - STRUCTURE FRAMEWORK FOR HAMILTONIAN DYNAMICAL SYSTEMS ∗

The Lie product and the order relation are viewed as defining structures for Hamiltonian dynamical systems. Their admissible combinations are singled out by the requirement that the group of the Lie automorphisms be contained in the group of the order automorphisms (Lie algebras with invariant cones). Taking advantage of the reciprocal independence of the relevant structures, the inclusion rela...

v 1 1 5 N ov 1 99 7 Chaotic eigenfunctions in phase space

We study individual eigenstates of quantized area-preserving maps on the 2-torus which are classically chaotic. In order to analyze their semiclassical behavior, we use the Bargmann–Husimi representations for quantum states, as well as their stellar parametrization, which encodes states through a minimal set of points in phase space (the constellation of zeros of the Husimi density). We rigorou...

Cover Vol.7, No.1, February 2010