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Mirrors > Home > NFE Home > Th. List > anbi1i | GIF version |
Description: Introduce a right 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 |
---|---|
anbi1i | ⊢ ((φ ∧ χ) ↔ (ψ ∧ χ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi.aa | . . 3 ⊢ (φ ↔ ψ) | |
2 | 1 | a1i 10 | . 2 ⊢ (χ → (φ ↔ ψ)) |
3 | 2 | pm5.32ri 619 | 1 ⊢ ((φ ∧ χ) ↔ (ψ ∧ χ)) |
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