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Related theorems GIF version |
| Description: An inference from a biconditional, related to modus ponens. |
| Ref | Expression |
|---|---|
| mpbir.min | ⊢ ψ |
| mpbir.maj | ⊢ (φ ↔ ψ) |
| Ref | Expression |
|---|---|
| mpbir | ⊢ φ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mpbir.min | . 2 ⊢ ψ | |
| 2 | mpbir.maj | . . 3 ⊢ (φ ↔ ψ) | |
| 3 | 2 | biimpr 152 | . 2 ⊢ (ψ → φ) |
| 4 | 1, 3 | ax-mp 7 | 1 ⊢ φ |