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Related theorems GIF version |
| Description: Commutation of antecedents. Swap 2nd and 3rd. |
| Ref | Expression |
|---|---|
| com3.1 | ⊢ (φ → (ψ → (χ → θ))) |
| Ref | Expression |
|---|---|
| com23 | ⊢ (φ → (χ → (ψ → θ))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | com3.1 | . 2 ⊢ (φ → (ψ → (χ → θ))) | |
| 2 | pm2.04 31 | . 2 ⊢ ((ψ → (χ → θ)) → (χ → (ψ → θ))) | |
| 3 | 1, 2 | syl 12 | 1 ⊢ (φ → (χ → (ψ → θ))) |