feat(LocallyNameless/Untyped): generalize eta_subst_fvar - #667
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`step_subst_cong_l` is the more general version
lengyijun
changed the title
eta_subst_fvar to eta_substeta_subst_fvar
chenson2018
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Jun 20, 2026
| induction steps with | ||
| | refl => rfl | ||
| | tail _ step ih => grind [step_subst_cong_l] | ||
| exact .single (Xi.abs {x} (by grind [step_subst_cong_l])) |
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It appears that (at the bottom of Properties) that we are missing a version of close_open_to_subst specialized to first openings, i.e. (m ^* x) ^ n = m [x := n] that if annotated with grind = would make the proof generated here better. Could you add this, please?
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What name is given to the new theorem?
chenson2018
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eta_subst_fvareta_subst_fvar
….lean Co-authored-by: Chris Henson <46805207+chenson2018@users.noreply.github.com>
….lean Co-authored-by: Chris Henson <46805207+chenson2018@users.noreply.github.com>
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step_subst_cong_lis the more general version