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Theorems · Definition · order theory

Set.PartiallyWellOrderedOn

{α : Type u_2} → Set α → (α → α → Prop) → Prop

s.PartiallyWellOrderedOn r indicates that the relation r is WellQuasiOrdered when restricted to s. A set is partially well-ordered by a relation r when any infinite sequence contains two elements where the first is related to the second by r. Equivalently, any antichain (see IsAntichain) is finite, see Set.partiallyWellOrderedOn_iff_finite_antichains. TODO: rename this to WellQuasiOrderedOn to match WellQuasiOrdered.

Defined in
Mathlib.Order.WellFoundedSet
Cited by
34 results in Mathlib
Foundations
Depth 5 from the axioms · uses no axioms

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