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This paper is Paper 0 of Cooperation Theory: written last, placed first. It lays down no propositions; it only does a few things for those who read this series: it states this series' place in SAE, sets out how far it reads and what its main line is, gives the method and the shared words the papers have in common, interfaces as a whole with several traditions, says once, all together, the directions of colonization read in the papers, sets side by side the two faces that the moment of two-way 15DD shows in Love Theory and in this series, lists together the thirty-eight propositions of the whole series, and registers the remainders that are left over and not closed out. Cooperation Theory is the third branch downstream of SAE Relation Theory, following Love Theory and Marriage Theory, and parallel to Marriage Theory: at the normative layer the two do not conflict; at the rule layer they can differ, because the kinds of relation differ. This series does not define all cooperation; the cooperation it reads has as its premise that at least one party is headed in the 15DD direction, that is, that at least one party recognizes the other as an end too in this undertaking; the direction is a premise, not a component, nor a sufficient condition for entering scope. Under this premise, two people, each for his own purpose, do together one thing that both avow and in which each has a share; neither party holds the purpose and adjudication of this undertaking alone, nor does it automatically produce, above the two, a "we" that legislates for both. The main line, put plainly: You for yours, I for mine, and we do this one thing together. For direction one party is enough; for participation both are needed; in judgment each uses his own. The seven papers read, in order: Doing Together; Each for Their Own Ends; Division of Labor; "We"; One Side; Each Bears a Share; The Process. This paper interfaces as a whole with Hobbes, Kropotkin and Mozi; Rawls and Tomasello are placed only as neighbors, and Kant's perpetual peace is pointed back to the Theory of Inter-State Cooperation. The directions of colonization read in the papers borrow things that are, or may come to be, in a cooperation: avowal; names; division of labor; procedure; giving, reciprocal exchange and contribution; friendship; the name of cultivation, and dependency; exit, and what is said out loud on exiting; and the premise, regarding a third person, of an arrangement the two jointly maintain. These things carry no direction in themselves; the direction is read on the one effect in which they are taken up to do something; each has its own antecedents to be checked first. This paper proves no proposition at the object layer.
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Han Qin (2026) studied this question.
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