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| Mirrors > Home > NFE Home > Th. List > adantl | GIF version | ||
| Description: Inference adding a conjunct to the left of an antecedent. (Contributed by NM, 30-Aug-1993.) (Proof shortened by Wolf Lammen, 23-Nov-2012.) | 
| Ref | Expression | 
|---|---|
| adantl.1 | ⊢ (φ → ψ) | 
| Ref | Expression | 
|---|---|
| adantl | ⊢ ((χ ∧ φ) → ψ) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | adantl.1 | . . 3 ⊢ (φ → ψ) | |
| 2 | 1 | adantr 451 | . 2 ⊢ ((φ ∧ χ) → ψ) | 
| 3 | 2 | ancoms 439 | 1 ⊢ ((χ ∧ φ) → ψ) | 
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