Now showing items 1-5 of 5

    • Closed embeddings of Hilbert spaces 

      Cojuhari, P.; Gheondea, A. (2010)
      Motivated by questions related to embeddings of homogeneous Sobolev spaces and to comparison of function spaces and operator ranges, we introduce the notion of closely embedded Hilbert spaces as an extension of that of ...
    • Closely embedded Krein spaces and applications to Dirac operators 

      Cojuhari, P.; Gheondea, A. (Elsevier, 2011-04-15)
      Motivated by energy space representation of Dirac operators, in the sense of K. Friedrichs, we recently introduced the notion of closely embedded Krein spaces. These spaces are associated to unbounded selfadjoint operators ...
    • Embeddings, operator ranges, and Dirac operators 

      Cojuhari, P.; Gheondea, A. (Springer Basel, 2011)
      Motivated by energy space representation of Dirac operators, in the sense of K. Friedrichs, we recently introduced the notion of closely embedded Kreǐn spaces. These spaces are associated to unbounded selfadjoint operators ...
    • Triplets of closely embedded Dirichlet type spaces on the unit polydisc 

      Cojuhari, P.; Gheondea, A. (Birkhaeuser Science, 2013)
      We propose a general concept of triplet of Hilbert spaces with closed embeddings, instead of continuous ones, and we show how rather general weighted L2 spaces yield this kind of generalized triplets of Hilbert spaces for ...
    • Triplets of closely embedded Hilbert spaces 

      Cojuhari, P.; Gheondea, A. (Springer, 2014)
      We obtain a general concept of triplet of Hilbert spaces with closed (unbounded) embeddings instead of continuous (bounded) ones. We provide a model and an abstract theorem as well for a triplet of closely embedded Hilbert ...