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  "citation": "Taylor, B. P. (2026). The Evolution of Cooperation. The Necessary Tangle, release 0.41. https://transduction.systems/entries/publication_fpcs_055/",
  "licence": "CC BY-SA 4.0 for original atlas text and data; linked works retain their own terms",
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    "description": "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.",
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    "canonical_definition": "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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    "title": "The Evolution of Cooperation",
    "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.",
    "canonical_definition": "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.",
    "why_it_matters": "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.",
    "context_and_lineage": "The article discusses kinship and reciprocation, reports Axelrod's tournaments, and credits Rapoport with submitting Tit for Tat. No intellectual connection to the other route papers is inferred from chronology.",
    "editorial_note": "Primary-source exposition and original model examples are distinguished from the explicitly fictional editorial inquiries and transfer questions. These new accounts await human editorial acceptance. The earlier catalogue review supported membership only.",
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    "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."
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      "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."
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    "common_misreadings": [
      "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."
    ],
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