quantum probability theory and quantum logic begins with von Neumann's recognition¹, that quantum mechanics can be regarded as a kind of "probability theory", if the subspace lattice L(H) of the system's Hilbert space H plays the role of event algebra and the "tr(WE)'-s play the role of probability distributions over these events. This idea had been completed in the Gleason theorem ²:" /> Critical reflections on quantum probability theory - Szabó László E. | sdvig press