bibkey: kochen1968problem
authors: Simon Kochen and Ernst P. Specker
year: 1968
title: The Problem of Hidden Variables in Quantum Mechanics
doi: 10.1512/iumj.1968.17.17004
claim: Contextual obstruction to dispersion-free valuation assignments in Hilbert spaces of dimension at least three.
strata_touched:
  - D5/S3/Quantum/FiniteDimensional
license: citation-only
triage: anchor

The Problem of Hidden Variables in Quantum Mechanics

Simon Kochen and Ernst P. Specker establish the contextual hidden-variable obstruction now bearing their names. This note is retained only to delimit the nearby literature: the repository’s qubit theorem concerns a unital global complex-algebra homomorphism on all of M_2(C), which is not a Kochen-Specker valuation on projections.

In particular, this source is not used as direct attestation that qubit projection valuations are impossible. The selected residual’s Kochen-Specker, CHSH, hidden-address, and probability-interpretation claims all remain unresolved.

Search log

• 2026-07-17: Queried NyxID/Tavily for "The Problem of Hidden Variables in Quantum Mechanics" DOI. Journal and DOI metadata verified the authors, exact title, and DOI 10.1512/iumj.1968.17.17004.
• 2026-07-17: Queried Kochen Specker theorem dimension two projection valuation dimension three. Results consistently placed the theorem’s obstruction in Hilbert dimension at least three and exposed the dimension two distinction relevant to the qubit scope guard.
• 2026-07-17: Queried Kochen Specker M2 C algebra character distinction. No source equated the two notions; the independent caller therefore required the document to label this paper as context only.

Verified locator

• DOI: https://doi.org/10.1512/iumj.1968.17.17004