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Proof step 8 from proof in-keyrange-in-ri-data (previous step)

adr ∈ (nused = 1 ⊃ ri;ri |≤ zbrar[0].key), nused ≤ # zbrar ⊦ # zbrar = 0, nused = 0, adr ∈ ri

User applied rule case distinction

And obtained the following new goals

Proof step 9:
adr ∈ ri |≤ zbrar[0].key, nused ≤ # zbrar ⊦ # zbrar = 0, nused = 0, nused = 1, adr ∈ ri

Rule argument

pos: left 1

Additional information