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feat(LocallyNameless/Untyped): FullEta.steps_open_cong_l - #705

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feat(LocallyNameless/Untyped): FullEta.steps_open_cong_l#705
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awesome-lambda-calculus:fulleta.steps_open_cong_l

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lengyijun force-pushed the fulleta.steps_open_cong_l branch 2 times, most recently from c05b3f9 to e7935cd Compare July 10, 2026 01:03
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Mirror of FullBeta.step_open_cong_l

@lengyijun
lengyijun force-pushed the fulleta.steps_open_cong_l branch from e7935cd to b87185d Compare July 21, 2026 00:31
@chenson2018 chenson2018 self-assigned this Jul 25, 2026
case refl => rfl
case head _ _ st _ ih => exact .trans (step_open_cong_r lc_s lc_t st) (ih (step_lc_r st))

theorem steps_open_cong_l {s s' t : Term Var} (xs : Finset Var)

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Similar to what I suggested in #738, I think it is useful to also have the single-step version of this even if it is technically less general.

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