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| Mirrors > Home > ILE Home > Th. List > com12 | GIF version | ||
| Description: Inference that swaps (commutes) antecedents in an implication. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 4-Aug-2012.) | 
| Ref | Expression | 
|---|---|
| com12.1 | ⊢ (𝜑 → (𝜓 → 𝜒)) | 
| Ref | Expression | 
|---|---|
| com12 | ⊢ (𝜓 → (𝜑 → 𝜒)) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | id 19 | . 2 ⊢ (𝜓 → 𝜓) | |
| 2 | com12.1 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
| 3 | 1, 2 | syl5com 29 | 1 ⊢ (𝜓 → (𝜑 → 𝜒)) | 
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