Caraballo Garrido, TomásKloeden, Peter E.Marín Rubio, Pedro2015-04-082015-04-0820030165-01141553-524Xhttp://hdl.handle.net/11441/23731Weak pullback attractors are de ned for nonautonomous setvalued processes and their existence and upper semi continuous convergence under perturbation is established. Unlike strong pullback attractors, invariance and pullback attraction here are required only for at least one trajectory rather than all trajectories at each starting point. The concept is useful in, for example, continuous time control systems and is related to that of viability.application/pdfengAtribución-NoComercial-SinDerivadas 4.0 Españahttp://creativecommons.org/licenses/by-nc-nd/4.0Navier-Stokes equationsnonlinear delay termspullback attractorswell-posed/ill-posed Navier-Stokesdelayed convective termtempered universes for non-autonomous dynamical systemsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1016/j.jmaa.2003.09.039