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Proof step 5 from proof square-neq-prime (previous step)

j * j = i * j0 * j0, prime(i), j ≠ 0 ∨ j0 ≠ 0 ⊦ 0 < j ∧ 0 ≤ j0

User applied rule cut formula

And obtained the following new goals

Proof step 6:
¬ j ≤ 0, j * j = i * j0 * j0, prime(i), j ≠ 0 ∨ j0 ≠ 0 ⊦ 0 < j ∧ 0 ≤ j0
Proof step 9:
j * j = i * j0 * j0, prime(i), j ≠ 0 ∨ j0 ≠ 0 ⊦ ¬ j ≤ 0, 0 < j ∧ 0 ≤ j0

Rule argument

fma: ¬ j ≤ 0

Additional information

Used formulas: ¬ j ≤ 0