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Proof step 17 from proof dec-int (previous step)

m0 + 1 = i→n(i), i < 0 ⊦ n→i(m0 + 1) = n→i(i→n(i)), i = 0, ~1 = n→i(m0) + i

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: discard

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