feat(untyped): the Leftmost Reduction Theorem#700
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m-ow wants to merge 10 commits into
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Can you add 2 theorems :
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Introduces leftmost reduction
⭢ℓ, a beta-step contracting the redex at position 0, together with normal forms, and proves the Leftmost Reduction Theorem: if a term beta-reduces to a normal form, the leftmost strategy reaches it too.The result falls out of standardization, following Copes (2018).
Builds on top of #679