@Article{Navara:IJTP04GeomLem,
  IS = { zkontrolovano 13 Jan 2005 },
  UPDATE  = { 2004-11-27 },
  author =     {Navara, Mirko},
  title =      {{P}iron's and {B}ell's geometrical lemmas},
  year =       {2004},
  month =      {July},
  pages =      {1587--1594},
  journal =    {International Journal of Theoretical Physics},
  publisher =  {Kluwer Academic Publishers},
  address =    {Dordrecht, The Netherlands},
  issn =       {0020-7748},
  volume =     {43},
  number =     {7},
  importance = {1},
  annote = {The famous Gleason's Theorem gives a characterization of
    measures on lattices of subspaces of Hilbert spaces. The attempts
    to simplify its proof lead to geometrical lemmas that possess also
    easy proofs of some consequences of Gleason's Theorem. We
    contribute to these results by solving two open problems
    formulated by Chevalier, Dvure{\v c}enskij and Svozil.  Besides,
    our use of orthoideals provides a unified approach to finite and
    infinite measures.},
  keywords =   {Gleason's Theorem, Bell inequalities, Bell's Geometrical Lemma; 
                Weak Piron's Geometrical Lemma, Hilbert space},
  project =    {GACR 201/00/0331, CTU 300114413},
  psurl = {[PDF, 69 KB] },
}