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Proof step 1 from proof case-20 (conclusion)

10 ≤ i, i < 20 ⊦ i = 10 ∨ i = 11 ∨ i = 12 ∨ i = 13 ∨ i = 14 ∨ i = 15 ∨ i = 16 ∨ i = 17 ∨ i = 18 ∨ i = 19

System applied rule normalize

And obtained the following new goals

Proof step 2:
i < 20, 10 ≤ i ⊦ i = 10, i = 11, i = 12, i = 13, i = 14, i = 15, i = 16, i = 17, i = 18, i = 19

Rule argument

Additional information