Fix constDF case in Stratified induction - #15
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Summary
This removes one
sorryinLean4Lean/Experimental/Stratified.lean, in theconstDFcase ofIsDefEq.induction1.This is the typed/stratified analogue of #14. The proof binds the recursive induction hypotheses explicitly in the
constDFcase pattern and uses the Γ-level induction hypothesis in reverse throughhdf.A first attempt with an explicit universe argument failed because it over-constrained the type index. Letting Lean infer the
.defequniverse argument resolves the index.Verification
Checked locally:
Both passed.
Note: the repository still contains unrelated existing
sorrys in other files; this PR only removes the targetsorryinStratified.lean.