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Proof step 7 from proof estimate-01 (previous step)

i * i0 = i1 * j + j1, i1 < i0, 0 < i0, 1 < i, 0 < j, 0 < i, j0 < i0, j < i, j1 < j, 0 ≤ j1, i1 ≤ j0 ⊦ i1 * j + j1 < i * i0

User applied rule weakening

And obtained the following new goals

Proof step 8:
j1 < j, j < i, j0 < i0, 0 < i, 0 < j, 1 < i, 0 < i0, i1 < i0, i1 ≤ j0, 0 ≤ j1 ⊦ i1 * j + j1 < i * i0

Rule argument

poslist: left 1

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