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Proof step 1 from proof case-10 (conclusion)

2 ≤ i, i < 10 ⊦ i = 2 ∨ i = 3 ∨ i = 4 ∨ i = 5 ∨ i = 6 ∨ i = 7 ∨ i = 8 ∨ i = 9

System applied rule normalize

And obtained the following new goals

Proof step 2:
i < 10, 2 ≤ i ⊦ i = 2, i = 3, i = 4, i = 5, i = 6, i = 7, i = 8, i = 9

Rule argument

Additional information