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Proof step 192 from proof inv-gc-copy (previous step)

# kx = # ax ⊦ ri-inj(ri) ∧ kx.toSet ⊆ dom ri ∧ ax.toSet ∩ range ri = ∅ ∧ ¬ dups(kx) ∧ ¬ dups(ax) → range ri[kx, ax] = (range ri \ ri[kx].toSet) ∪ ax.toSet

Proof step 192 from proof inv-gc-copy (previous step)

A spec-lemma