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Proof step 1 from proof disj-shift (conclusion)

⊦ v × m ∈ recs ∧ v ∈ vols ∧ recs ⊥ vols → recs -- (v × m) ⊥ vols[v, vols[v][m, ebae]]

System applied rule normalize

And obtained the following new goals

Proof step 2:
v × m ∈ recs, v ∈ vols, recs ⊥ vols ⊦ recs -- (v × m) ⊥ vols[v, vols[v][m, ebae]]

Rule argument

Additional information