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| Description: Commutation of antecedents. Swap 1st and 4th. (Contributed by NM, 25-Apr-1994.) (Proof shortened by Wolf Lammen, 28-Jul-2012.) | 
| Ref | Expression | 
|---|---|
| com4.1 | ⊢ (𝜑 → (𝜓 → (𝜒 → (𝜃 → 𝜏)))) | 
| Ref | Expression | 
|---|---|
| com14 | ⊢ (𝜃 → (𝜓 → (𝜒 → (𝜑 → 𝜏)))) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | com4.1 | . . 3 ⊢ (𝜑 → (𝜓 → (𝜒 → (𝜃 → 𝜏)))) | |
| 2 | 1 | com4l 92 | . 2 ⊢ (𝜓 → (𝜒 → (𝜃 → (𝜑 → 𝜏)))) | 
| 3 | 2 | com3r 87 | 1 ⊢ (𝜃 → (𝜓 → (𝜒 → (𝜑 → 𝜏)))) | 
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