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Related theorems GIF version |
| Description: Inference adding a conjunct to the left of an antecedent. |
| Ref | Expression |
|---|---|
| adantl.1 | ⊢ (φ → ψ) |
| Ref | Expression |
|---|---|
| adantl | ⊢ ((χ ⋀ φ) → ψ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | adantl.1 | . . 3 ⊢ (φ → ψ) | |
| 2 | 1 | a1i 8 | . 2 ⊢ (χ → (φ → ψ)) |
| 3 | 2 | imp 350 | 1 ⊢ ((χ ⋀ φ) → ψ) |