Fix constDF case in StratifiedUntyped induction - #14
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Summary
This removes one
sorryinLean4Lean/Experimental/StratifiedUntyped.lean, in theconstDFcase ofIsDefEq.inductionU1.The proof works by binding the recursive induction hypotheses explicitly in the
constDFcase pattern, then using the Γ-level induction hypothesis in reverse throughhdf.Verification
Checked locally:
Both passed.
Note: the repository still contains unrelated existing
sorrys in other files; this PR only removes the targetsorryinStratifiedUntyped.lean.