Journal of Physics A Mathematical and GeneralTwo simple proofs of the Kochen-Specker theoremAsher PeresPublished Feb 21, 1991• 422 citationsPublisherAbstractA new proof of the Kochen-Specker theorem uses 33 rays, instead of 117 in the original proof. If the number of dimensions is increased from 3 to 4, only 24 rays are needed.DOI10.1088/0305-4470/24/4/003