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Proof step 28 from proof del-uni (
previous step
)
H0 -- r ⊥ H1 -- r, H0 ⊥ H1, r0 ≠ r ∧ r0 ∈ H0 ∨ r0 ≠ r ∧ r0 ∈ H1 ⊦ r0 ≠ r ∧ (r0 ∈ H0 ∨ r0 ∈ H1)
User applied rule case distinction
And closed the goal!
Rule argument
pos: right 1
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