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Proof step 5 from proof abs-dirs-gc-copy (previous step)

# ax = # kx ⊦ new(ax, fs) ∧ ¬ dups(ax) ∧ ¬ dups(kx) ∧ ri-cons(ri, fs) ∧ kx.toSet ⊆ dom ri ∧ key ∈ ri → fs[ax, fs[ri[kx]]][ri[kx, ax][key]] = fs[ri[key]]

Proof step 5 from proof abs-dirs-gc-copy (previous step)

A spec-lemma