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@misc{cogprints3415, volume = {30}, number = {9}, month = {October}, author = {Diederik Aerts and Ellie D'Hondt and Liane Gabora}, editor = {Alwyn van der Merwe}, title = {Why the Disjunction in Quantum Logic is Not Classical}, publisher = {Plenum/Kluwer}, year = {2000}, journal = {Foundations of Physics}, pages = {1473--1480}, keywords = {quantum, nondisjunction, correlation, potential, logic, concept, classical, state, conjunction, negation, category, pet fish problem}, url = {http://cogprints.org/3415/}, abstract = {The quantum logical `or' is analyzed from a physical perspective. We show that it is the existence of EPR-like correlation states for the quantum mechanical entity under consideration that make it nonequivalent to the classical situation. Specifically, the presence of potentiality in these correlation states gives rise to the quantum deviation from the classical logical `or'. We show how this arises not only in the microworld, but also in macroscopic situations where EPR-like correlation states are present. We investigate how application of this analysis to concepts could alleviate some well known problems in cognitive science. } }