`EqLift`🔗

Definition

Transforms an equality expression by lifting both sides to a common universe level.

The tactic supports location specifiers like rw or simp:

lift_eq — applies to the goal
lift_eq at h — applies to hypothesis h
lift_eq at h₁ h₂ — applies to multiple hypotheses
lift_eq at h ⊢ — applies to hypothesis h and the goal
lift_eq at * — applies to all hypotheses and the goal

def

EqLift : Lean.ParserDescr
EqLift : Lean.ParserDescr

Code

syntax (name := EqLift) "lift_eq" (ppSpace location)? : tactic

Actions: Source · Open Issue

New in v4.34.0-rc1-13-gd54da15 (2026-08-21), and its meaning has not changed since.

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, 13 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.

EqLift🔗

`EqLift`🔗