Readable atlas · Release 0.37
The Evolution of Cooperation
A game-theoretic and tournament study of conditions under which reciprocal cooperation can perform well, resist invasion, and gain a foothold in repeated prisoner's-dilemma interaction.
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Summary
Tit for Tat cooperates first, then copies its partner's previous move. The paper distinguishes tournament performance, stability against invasion, and initial viability. Its results depend on payoffs, repeated encounters, recognition, and the strategies and interaction patterns present; persistent defection can also remain stable.
Implications for practice
A result about cooperation has to identify the environment that supports it. Reciprocity is a conditional mechanism to examine, not a general instruction to retaliate.
Key distinctions
- A tournament score, resistance to invasion, and entry into an established population are distinct tests.
- A constant probability of another encounter differs from a known final round. Recognition and memory, or functional equivalents, matter for partner-contingent responses.
- Relatedness and preferential interaction are different mechanisms; neither automatic cooperation nor the irrelevance of kinship follows.
Historical development
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Ideas it depends on
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Further developments
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Connections to practice
- Original-model arithmetic: figure 1 uses T=5,R=3,P=1,S=0. Equation1 requires continuation probability w to meet both (T−R)/(T−P) and (T−R)/(R−S) thresholds for the stated stability result: 1/2 and 2/3. Thus w=0.8 meets both; w=0.5 does not. The arithmetic is editorial, using the paper's payoffs.
- Fictional editorial inquiry: give two abstract players those stipulated points and a 0.8 chance of another round. Compare Tit for Tat with itself and unconditional defection; then explicitly add observation error as a new variant and compare the result. No service-team outcomes are measured.
- Editorial transfer limit: test whether encounters, observable choices, power, multi-party effects, and payoffs really fit this two-player model. A tournament victory is no evidence for mechanically retaliating against colleagues or service users.
Common confusions
- Tit for Tat is universally optimal.
- A cooperative population necessarily emerges from any initial state.
- A tournament result settles noisy, changing-partner, or unequal-power organisational cases.
Further checks
- The paper's own evolutionary-stability formulation is retained, rather than silently substituted with every later game-theoretic definition.
- The author-hosted PDF was read in the source pass; a byte hash is unavailable, and the later coordinator request returned 403.
Recorded connections
Check the wording, direction, scope, sources, and status of a connection before relying on it.
The Evolution of Cooperation authored by R. Axelrod
Status: accepted · Relation: authored by
Bibliographic first pass: records authorship or collection structure, not a full evaluation of the work or influence.
Locator: Official Foundational Papers in Complexity Science table of contents
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
The Evolution of Cooperation authored by W. D. Hamilton
Status: accepted · Relation: authored by
Bibliographic first pass: records authorship or collection structure, not a full evaluation of the work or influence.
Locator: Official Foundational Papers in Complexity Science table of contents
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
The Evolution of Cooperation is part of Foundational Papers in Complexity Science, volume 3
Status: accepted · Relation: part of
Bibliographic first pass: records authorship or collection structure, not a full evaluation of the work or influence.
Locator: Official Foundational Papers in Complexity Science table of contents
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
The Evolution of Cooperation is item in Foundational Papers in Complexity Science
Status: accepted · Relation: part of
Official table of contents, volume 3, item 55.
No statement-level locator recorded.
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
Status: accepted · Relation: presents
This records documentary collection structure only. Inclusion does not by itself establish conceptual influence, agreement, importance or validity.
Locator: Official collection table of contents
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
Status: accepted · Relation: presents
This records documentary collection structure only. Inclusion does not by itself establish conceptual influence, agreement, importance or validity.
Locator: Official collection table of contents
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
Sources and passage locators
- Foundational Papers in Complexity Science — official tables of contents (checked primary register)
- The Evolution of Cooperation (research pass needs editor)
- The Evolution of Cooperation: pp. 1391–1393, figure 1, Robustness and Stability · research pass needs editor
- The Evolution of Cooperation: pp. 1392–1393, equation 1 · research pass needs editor
- The Evolution of Cooperation: pp. 1393–1396, Initial viability and biological applications · research pass needs editor
Cite this entry
Taylor, B. P. (2026). The Evolution of Cooperation. The Necessary Tangle, release 0.37. https://transduction.systems/entries/publication_fpcs_055/
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