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| Description: Elimination of a conjunct. Theorem *3.26 (Simp) of [WhiteheadRussell] p. 112. (Contributed by NM, 3-Jan-1993.) (Proof shortened by Wolf Lammen, 14-Jun-2022.) |
| Ref | Expression |
|---|---|
| simpl | ⊢ ((𝜑 ∧ 𝜓) → 𝜑) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 22 | . 2 ⊢ (𝜑 → 𝜑) | |
| 2 | 1 | adantr 480 | 1 ⊢ ((𝜑 ∧ 𝜓) → 𝜑) |
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