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Proof step 7 from proof ubyte-mult (
previous step
)
⊦ 0 ≤ i ∧ 0 ≤ j ∧ 0 ≤ i1 ∧ 0 ≤ j1 ∧ i < i1 ∧ j < j1 → i * j < i1 * j1
A spec-lemma