Josef Tkadlec, Department of Mathematics, Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 166 27 Praha 6, Czech Republic, e-mail: tkadlec@math.feld.cvut.cz
Keywords: Boolean algebra, concrete quantum logic, covering, Jauch-Piron state, orthocompleteness
Classification (MSC2000): 03G12, 81P10
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