Description: For when pm3.4 lacks a pm3.4i. (Contributed by Jarvin Udandy, 9-Sep-2020)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | jabtaib.1 | ⊢ ( 𝜑 ∧ 𝜓 ) | |
| Assertion | jabtaib | ⊢ ( 𝜑 → 𝜓 ) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | jabtaib.1 | ⊢ ( 𝜑 ∧ 𝜓 ) | |
| 2 | pm3.4 | ⊢ ( ( 𝜑 ∧ 𝜓 ) → ( 𝜑 → 𝜓 ) ) | |
| 3 | 1 2 | ax-mp | ⊢ ( 𝜑 → 𝜓 ) |