feat(LocallyNameless/Untyped): subst_intro weaker precondition#666
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subst_intro weaker condition
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subst_intro weaker conditionsubst_intro weaker precondition
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- New theorem `subst_intro_openrec` - `subst_intro` no longer needs `LC t` - `subst_intro` no longer needs `subst_fresh` - `subst_intro` new proof based on `subst_intro_openrec` - Updated `preservation_open` in STLC to take advantage of the weaker precondition Co-authored-by: Chris Henson <46805207+chenson2018@users.noreply.github.com>
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subst_intro_openRecsubst_introno longer needsLC tsubst_introno longer needssubst_freshsubst_intronew proof based onsubst_intro_openRecpreservation_openin STLC to take advantage of the weaker precondition