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Proof step 15 from proof lebs-write (previous step)

n = m ∨ m2 = n ∧ @(n, m3, m4) ∈ ri ⊦ key ∈ ri, ∃ adr. adr.lnum = n ∧ adr ∈ ri[key, @(m, m0, m1)]

User applied rule case distinction

And obtained the following new goals

Proof step 16:
n = m ⊦ key ∈ ri, ∃ adr. adr.lnum = n ∧ adr ∈ ri[key, @(m, m0, m1)]
Proof step 18:
m2 = n, @(n, m3, m4) ∈ ri ⊦ key ∈ ri, ∃ adr. adr.lnum = n ∧ adr ∈ ri[key, @(m, m0, m1)]

Rule argument

pos: left 1

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