Número Completo v. 5, n. 1, (2022)

$n$-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. ‎$R$...

Curso completo de HTML

06 1 v 1 1 5 Ja n 20 01 Quantum Information Theory – an Invitation

This text is part of a volume entitled " Quantum information — an introduction to basic theoretical concepts and experiments " , to be published in Springer Tracts in Modern Physics. Authors will be From the foundations of quantum theory to quantum technology-an introduction Mixed-state entanglement and quantum communication Joint index Joint list of references References to " articles in this ...

5 v 1 1 4 N ov 1 99 4 Renormalizing Partial Differential Equations

We explain how to apply Renormalization Group ideas to the analysis of the long-time asymptotics of solutions of partial differential equations. We illustrate the method on several examples of nonlinear parabolic equations. We discuss many applications, including the stability of profiles and fronts in the Ginzburg-Landau equation, anomalous scaling laws in reaction-diffusion equations, and the...

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...