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Proof step 1 from proof toSet-subseteq-domri-notin (conclusion)

⊦ kx.toSet ⊆ dom ri ∧ ¬ key ∈ ri → ¬ key ∈ kx

System applied rule normalize

And obtained the following new goals

Proof step 2:
key ∈ kx, kx.toSet ⊆ dom ri ⊦ key ∈ ri

Rule argument

Additional information