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Mirrors > Home > ILE Home > Th. List > anbi2i | GIF version |
Description: Introduce a left conjunct to both sides of a logical equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 16-Nov-2013.) |
Ref | Expression |
---|---|
bi.aa | ⊢ (𝜑 ↔ 𝜓) |
Ref | Expression |
---|---|
anbi2i | ⊢ ((𝜒 ∧ 𝜑) ↔ (𝜒 ∧ 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi.aa | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
2 | 1 | a1i 9 | . 2 ⊢ (𝜒 → (𝜑 ↔ 𝜓)) |
3 | 2 | pm5.32i 451 | 1 ⊢ ((𝜒 ∧ 𝜑) ↔ (𝜒 ∧ 𝜓)) |
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