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refactor(Semantics/Aggregation): move out of Core, prove welfarism - #6033
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hawkrobe
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October 31, 2026 00:42
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Social choice is not upstream material, so
Core/SocialChoicebecomes the theory-layerSemantics/Aggregation(namespaceAggregation), restated on mathlib's order-theoretic objects.fun v ↦ v ⁻¹'o R(mathlibOrder.Preimage), and independence, Pareto indifference, output shape, anonymity and invariance follow from properties ofR; welfarism as an iff (three or more objects, preorder outputs), and D'Ambrosio & Hedden fn. 16Set.univ.pi) and diagonals (const ι '') of the single-scale groups, adding cardinal non-comparability; weak Pareto viaStrongLT, strong Pareto via the Pi order