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Proof step 5 from proof nat-to-int-ge-0 (previous step)

~1 = n→i(n + n0) ⊦ n→i(n + n0) ≥ 0

User applied rule weakening

And obtained the following new goals

Proof step 6:
⊦ n→i(n + n0) ≥ 0

Rule argument

poslist: left 1

Additional information