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Related theorems GIF version |
| Description: Join consequents with conjunction. |
| Ref | Expression |
|---|---|
| 3jca.1 | ⊢ (φ → ψ) |
| 3jca.2 | ⊢ (φ → χ) |
| 3jca.3 | ⊢ (φ → θ) |
| Ref | Expression |
|---|---|
| 3jca | ⊢ (φ → (ψ ⋀ χ ⋀ θ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3jca.1 | . . . 4 ⊢ (φ → ψ) | |
| 2 | 3jca.2 | . . . 4 ⊢ (φ → χ) | |
| 3 | 1, 2 | jca 288 | . . 3 ⊢ (φ → (ψ ⋀ χ)) |
| 4 | 3jca.3 | . . 3 ⊢ (φ → θ) | |
| 5 | 3, 4 | jca 288 | . 2 ⊢ (φ → ((ψ ⋀ χ) ⋀ θ)) |
| 6 | df-3an 779 | . 2 ⊢ ((ψ ⋀ χ ⋀ θ) ↔ ((ψ ⋀ χ) ⋀ θ)) | |
| 7 | 5, 6 | sylibr 200 | 1 ⊢ (φ → (ψ ⋀ χ ⋀ θ)) |