Bell's theorem without inequalities and without probabilities for two observers.
A proof of Bell's theorem using two maximally entangled states of two qubits is presented. It exhibits a similar logical structure to Hardy's argument of "nonlocality without inequalities." However, it works for 100% of the runs of a certain experiment. Therefore, it can also be viewed as a Greenberger-Horne-Zeilinger-like proof involving only two spacelike separated regions.
Cabello
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Departamento de Física Aplicada II, Universidad de Sevilla, 41012 Sevilla, Spain. adan@cica.es