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Proof step 6 from proof add-cancel-01 (previous step)

(⌜n0⌝ + ⌜1⌝ ) + n∞1 = (⌜n0⌝ + ⌜1⌝ ) + n∞2, n∞1 + ⌜1⌝ = n∞2 + ⌜1⌝ ⊦ n∞1 = n∞2

User applied rule weakening

And obtained the following new goals

Proof step 7:
n∞1 + ⌜1⌝ = n∞2 + ⌜1⌝ ⊦ n∞1 = n∞2

Rule argument

poslist: left 1

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