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Proof step 6 from proof factor-rat-01 (previous step)

i1 * j = ~ i1 * ~ j, j < 0 ⊦ j = 0, i1 = 0, rational(i1 * i, i1 * j) = rational(i, j)

User applied rule insert equation

And obtained the following new goals

Proof step 7:
j < 0 ⊦ j = 0, i1 = 0, rational(i1 * i, ~ i1 * ~ j) = rational(i, j)

Rule argument

pos: left 1 flags: discard

Additional information