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Proof step 5 from proof abs-eqall (previous step)

0 ≤ i ⊦ abs(i * j) = i * abs(j)

User applied rule cut formula

And closed the goal!

Rule argument

fma: j < 0

Additional information

Used simplifier rules: minus-left: ⊦ ~ i * j = ~(i * j);%associativity: ⊦ i * j * j0 = (i * j) * j0;%commutativity: ⊦ i * j = j * i;%zero-le-01: ⊦ i < 0 → (i * j ≤ 0 ↔ 0 ≤ j);%zero-ge-02: ⊦ 0 ≤ i → (0 ≤ i * j ↔ i = 0 ∨ 0 ≤ j);%associativity: ⊦ i * j * j0 = (i * j) * j0;%commutativity: ⊦ i * j = j * i;% ⊦ ¬ j < 0 → abs(j) = j; (s)% ⊦ abs(i) = i ↔ 0 ≤ i; (s)% ⊦ i ≤ j ↔ ¬ j < i; (ss)% ⊦ j < 0 → abs(j) = 0 - j; (s)% ⊦ 0 - i = ~ i; (s)% ⊦ ~ i = j ↔ i + j = 0; (s)% ⊦ abs(i) + i = 0 ↔ i ≤ 0; (s)% ⊦ i ≤ j → (j < i ↔ false); (as)%add-a: ⊦ i + j + i0 = (i + j) + i0; from specification int-basic2%add-c: ⊦ i + j = j + i; from specification int-basic2 Used formulas: j < 0