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| Description: Elimination of a conjunct. Theorem *3.26 (Simp) of [WhiteheadRussell] p. 112. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 13-Nov-2012.) | 
| Ref | Expression | 
|---|---|
| simpl | ⊢ ((𝜑 ∧ 𝜓) → 𝜑) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | ax-ia1 106 | 1 ⊢ ((𝜑 ∧ 𝜓) → 𝜑) | 
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