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Mirrors > Home > ILE Home > Th. List > eqeq2d | GIF version |
Description: Deduction from equality to equivalence of equalities. (Contributed by NM, 27-Dec-1993.) |
Ref | Expression |
---|---|
eqeq2d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
eqeq2d | ⊢ (𝜑 → (𝐶 = 𝐴 ↔ 𝐶 = 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq2d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | eqeq2 2180 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐴 ↔ 𝐶 = 𝐵)) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐶 = 𝐴 ↔ 𝐶 = 𝐵)) |
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