@Article{DeSimoneNavaraPtak:IJTP05,
  IS = { zkontrolovano 02 Jan 2006 - duplicita zmenena na zaznam s 0 hodnotou},
  UPDATE  = { 2005-12-14 },
  author =     {Anna De~Simone and Mirko Navara and Pavel Pt{\'a}k},
  title =      {Extending states on finite concrete logics},
  year =       {2005},
  month =      {July},
  pages =      {711--717},
  journal =    {International Journal of Theoretical Physics},
  publisher =  {Kluwer Academic Publishers},
  address =    {Dordrecht, The Netherlands},
  issn =       {0020-7748},
  volume =     {44},
  number =     {7},
  importance = {1},
  authorship = {33-33-33},
  annote = {In this note we collect several observations on state
    extensions. They may be instrumental to anyone who pursues the
    theory of quantum logics. In particular, we find out when
    extensions (resp. signed extensions) exist in the "concrete"
    concrete logic of all even-element subsets of an even-element
    set. We also mildly add to the study of difference-closed logics
    by finding an extension theorem for subadditive states.},
  keywords =   {(concrete) quantum logic, state, extension},
  project =    {MSM 6840770013, MIRACLE ICA1-CT-2000-70002, GACR 201/03/0455},
  psurl = {[PDF] },
}