Ara es mostren els items 6-25 de 30

    • Càlcul integral per a enginyers 

      Compta Creus, Albert; Bonet Revés, Carles; Consul Porras, M. Nieves; Ollé Torner, Mercè; Roig Martí, Agustín (Universitat Politècnica de Catalunya, 2002)
      Llibre
      Accés restringit a la comunitat UPC
      El càlcul integral és una matèria bàsica dins els plans d'estudis de les enginyeries i les llicenciatures científiques. Aquest llibre és una introducció a la teoria de la integració de diverses variables i la integració ...
    • Classi fication of monogenic invariant subspaces and uniparametric linear control systems 

      Compta Creus, Albert; Ferrer Llop, Josep (2012-12)
      Report de recerca
      Accés obert
      The classification of the invariant subspaces of an endomorphism has been an open problem for a long time, and it is a ”wild” problem in the general case. Here we obtain a full classification for the monogenic ones. Some ...
    • Consideraciones en torno al problema del desacoplamiento 

      Clotet Juan, Josep; Compta Creus, Albert (2005)
      Article
      Accés obert
    • Contribució a l'estudi geomètric de subespais invariants respecte a transformacions i sistemes lineals 

      Compta Creus, Albert (Universitat Politècnica de Catalunya, 2001-10-19)
      Tesi
      Accés obert
      Mitjançant tècniques geomètriques, abordem les qüestions següents:<br/><br/>(i) Estudi (caracterització, classificació, famílies diferenciables,...) d'una classe destacada de subespais invariants, els anomenats ...
    • Dimension of the orbit of marked subspaces 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2004)
      Article
      Accés obert
      Given a nilpotent endomorphism, we consider the manifold of invariant subspaces having a fixed Segre characteristic. In [Linear Algebra Appl., 332–334 (2001) 569], the implicit form of a miniversal deformation of an ...
    • Geometric classification of monogenic subspaces and uniparametric linear control systems 

      Compta Creus, Albert; Ferrer Llop, Josep (Taylor & Francis, 2015)
      Article
      Accés obert
      We present a geometric approach to the classification of monogenic invariant subspaces, alternative to the classical algebraic one, which allows us to obtain several matricial canonical forms for each class. Some applications ...
    • Geometric structure of single/combined equivalence classes of a controllable pair 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2011-11)
      Article
      Accés obert
      Given a pair of matrices representing a controllable linear system, its equivalence classes by the single or combined action of feedbacks, change of state and input variables, as well as their intersection are studied. ...
    • Geometric structure of the equivalence classes of a controllable pair 

      Peña Carrera, Marta; Compta Creus, Albert; Ferrer Llop, Josep (2010)
      Comunicació de congrés
      Accés obert
      Given a pair of matrices representing a controllable linear system, we study its equivalence classes by the single or combined action of feedbacks and change of state and input variables, as well as their intersections. ...
    • Local differentiable pole assignment 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (Taylor & Francis, 2010)
      Article
      Accés obert
      Given a general local differentiable family of pairs of matrices, we obtain a local differentiable family of feedbacks solving the pole assignment problem, that is to say, shifting the spectrum into a prefixed one. We ...
    • Matricial realizations of the solutions of the Carlson problem 

      Compta Creus, Albert; Ferrer Llop, Josep (2001)
      Article
      Accés obert
      The Klein theorem asserts the existence of a solution of the Carlson problem when a related Littelewood-Richardson sequence exists. Here we present an explicit construction of these matricial solutions.
    • Miniversal deformations of marked matrices 

      Compta Creus, Albert; Ferrer Llop, Josep; Puerta Sales, Ferran (2001)
      Article
      Accés obert
      Given the set of square matricesM⊂Mn+m(C) that keep the subspace W = Cnx{0} ⊂ Cn+m invariant, we obtain the implicit form of a miniversal deformation of a matrix a∈M, and we compute it explicitely when this matrix is ...
    • Miniversal deformations of observable marked matrices 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2014)
      Article
      Accés restringit per política de l'editorial
      Given the set of vertical pairs of matrices ${\cal M}\subset M_{m,n}(\mathbb C)\times M_n(\mathbb C)$ keeping the subspace $\mathbb C^d\times\{0\}\subset\mathbb C^n$ invariant,we compute miniversal deformations of a given ...
    • Miniversal deformations of observable marked matrices 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2012)
      Report de recerca
      Accés obert
      Given the set of vertical pairs of matrices M¿ Mm,n(C)×Mn(C) keeping the subspace Cd×{0} ¿ Cn invariant, we compute miniversal deformations of a given pair when it is observable and the subspace Cd × {0} is marked. ...
    • On the effect of friend feedbacks 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2009)
      Article
      Accés obert
      Given S an (A;B)-invariant subspace, we prove that the set of friend feedbacks is a (nm¡md+dq)-dimensional linear variety, which can be considered as the direct sum of the feedbacks of the restriction to S and the ...
    • On the effect of friend feedbacks 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2011)
      Article
      Accés restringit per política de l'editorial
      Given S an (A,B)-invariant subspace, we prove that the set of friend feedbacks is a linear variety, which can be considered as the direct sum of the feedbacks of the restriction to S and the co-restriction to S ⊥. In ...
    • Output regulation problem for differentiable families of linear systems 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2010)
      Article
      Accés obert
      Given a family of linear systems depending on a parameter varying in a differentiable manifold, we obtain sufficient conditions for the existence of a (global or local) differentiable family of controllers solving the ...
    • Output regulation problem for differentiable families of linear systems 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2009)
      Article
      Accés obert
      Given a family of linear systems depending on a parameter varying in a differentiable manifold, we obtain sufficient conditions for the existence of a (global or local) differentiable family of controllers solving the ...
    • Perturbations preserving conditioned invariant subspaces 

      Peña Carrera, Marta; Compta Creus, Albert; Ferrer Llop, Josep (2010)
      Comunicació de congrés
      Accés obert
      Given the set of matrix pairs M ⊂ Mm,n(C) × Mn(C) keeping a subspace S ⊂ Cn invariant, we obtain a miniversal deformation of a pair belonging to an open dense subset of M. It generalizes the known results when S is a ...
    • Perturbations preserving conditioned invariant subspaces 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2011)
      Article
      Accés restringit per política de l'editorial
      Given the set of matrix pairsM Mm,n.C/ Mn.C/ keeping a subspace S Cn invariant, we obtain a miniversal deformation of a pair belonging to an open dense subset ofM. It generalizes the known results when S is a ...
    • Perturbed marked reduced forms of invariant subspaces 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (Elsevier, 2018-12-15)
      Article
      Accés obert
      The classification of invariant subspaces is an open problem related to other important ones like the Carlson problem. Here we obtain a reduced form of these invariant subspaces as a new tool to tackle these problems. In ...