`finisherKernelUnlift`🔗

Definition

Constructs the finisher proof that concludes the unlifting after rewriting the equalities.

def

finisherKernelUnlift :
  Lean.Expr →
    Lean.Expr →
      (lhs rhs : Lean.Expr) →
        (maxLvl : Lean.Level) → Lean.MetaM Lean.Expr
finisherKernelUnlift :
  Lean.Expr →
    Lean.Expr →
      (lhs rhs : Lean.Expr) →
        (maxLvl : Lean.Level) →
          Lean.MetaM Lean.Expr

Code

def finisherKernelUnlift (_ _ lhs rhs : Expr) (maxLvl : Level) : MetaM Expr := do
  let (X, Y, xLvl, yLvl) ← getTypesFromKernel lhs
  let ex ← constructMeasurableEquiv X xLvl maxLvl
  let ey ← constructMeasurableEquiv Y yLvl maxLvl
  let lift_congr_expr ← mkAppM ``lift_congr #[ex, ey, lhs, rhs]
  mkAppM ``Iff.symm #[lift_congr_expr]

Actions: Source · Open Issue

Meaning last changed in v4.34.0-rc2-1-g439785b (2026-08-23).

Self-contained, with its dependencies inlined and proofs replaced by sorry: download the raw file · open it in the Lean web editor.

Dependency graph

Audit surface: 2 project declarations, 106 external constants

✓ Proved: no sorry anywhere in its closure

This is the tool's own reading of one build's recorded axioms, and it is not robust against an author who wants it to pass. Checking meant to be relied on should go through Comparator, which replays the proof through the kernel from an export against an explicit list of permitted axioms.

finisherKernelUnlift🔗

`finisherKernelUnlift`🔗