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Proof step 1 from proof even-not-ex (conclusion)

⊦ i % 2 ≠ 0 ↔ (∃ i0. i = 2 * i0 + 1)

User applied rule cut formula

And obtained the following new goals

Proof step 2:
0 ≤ i ⊦ i % 2 ≠ 0 ↔ (∃ i0. i = 2 * i0 + 1)
Proof step 4:
⊦ 0 ≤ i, i % 2 ≠ 0 ↔ (∃ i0. i = 2 * i0 + 1)

Rule argument

fma: 0 ≤ i

Additional information

Used formulas: 0 ≤ i