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Proof step 5 from proof shiftright-not-pos (previous step)

¬ 0 ≤ i >> j, 0 < i >> j, i < 0 ⊦

User applied rule weakening

And obtained the following new goals

Proof step 6:
¬ 0 ≤ i >> j, 0 < i >> j ⊦

Rule argument

poslist: left 3

Additional information