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Proof step 1 from proof case-30 (conclusion)

20 ≤ i, i < 30 ⊦ i = 20 ∨ i = 21 ∨ i = 22 ∨ i = 23 ∨ i = 24 ∨ i = 25 ∨ i = 26 ∨ i = 27 ∨ i = 28 ∨ i = 29

System applied rule normalize

And obtained the following new goals

Proof step 2:
i < 30, 20 ≤ i ⊦ i = 20, i = 21, i = 22, i = 23, i = 24, i = 25, i = 26, i = 27, i = 28, i = 29

Rule argument

Additional information