`getKernelRHSEqProofType`🔗

Definition

Given an equality between a categorical morphism (left) and a "morphized" kernel (right), get the kernel on the right side of the equality.

def

getKernelRHSEqProofType (e : Lean.Expr) : Lean.MetaM Lean.Expr
getKernelRHSEqProofType (e : Lean.Expr) :
  Lean.MetaM Lean.Expr

Code

def getKernelRHSEqProofType (e : Expr) : MetaM Expr := do
  let some (_, _, hom_expr) := (← inferType e).eq? | throwError "Expected an equality, got: {e}."
  match hom_expr.getAppFn with
  | Expr.const ``Kernel.hom _ =>
    let args := hom_expr.getAppArgs
    return args[args.size - 2]!
  | _ => throwError "Expected a hom expression, got: {hom_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

Nothing to draw. Its statement rests on no other declaration in this project, and names nothing from a package left unaudited — so the graph is this declaration alone. That is the answer, not a missing picture.

Audit surface: 0 project declarations, 102 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.

getKernelRHSEqProofType🔗

`getKernelRHSEqProofType`🔗