Onsager: exact solution of the two-dimensional Ising model

What changed

Exactly evaluated zero-field two-dimensional Ising partition function and critical behavior.

Scientific scope

The record is Onsager's sole-author 1944 Physical Review paper. It is restricted to the model and zero-field setting treated there and does not absorb Kaufman's spinor analysis, later magnetization results or other lattice models.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is Onsager's sole-author 1944 Physical Review paper. It is restricted to the model and zero-field setting treated there and does not absorb Kaufman's spinor analysis, later magnetization results or other lattice models.

Contributors

• Lars Onsager · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

• APS page for Onsager crystal statistics paper
• CERN record for Onsager crystal statistics paper

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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