Fin.orderIsoTriple

{α : Type u_1} → [inst : Preorder α] → [inst_1 : DecidableEq α] → (a b c : α) → a < b → b < c → Fin 3 ≃o ↥{a, b, c}

This is the order isomorphism from Fin 3 to a finset {a, b, c} when a < b and b < c.

Defined in: Mathlib.Order.Fin.Finset
Cited by: 3 results in Mathlib
Foundations: Depth 59 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: Preorder DecidableEq

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