Research proof index

Illustration that equiv_implies_canonical_eq does not hold for all functions f -- in particular, does not hold for Prod.fst. (One canonicalize produces [(1, false)], and the other produces [(1, true)].) -/ example : xs = [(1, false), (1, true)] → ys = [(1, true), (1, false)] → xs ≡ ys ∧ (canonicalize Prod.fst xs) ≠ (canonicalize Prod.fst ys) :...