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| Mirrors > Home > ILE Home > Th. List > eqtrd | GIF version | ||
| Description: An equality transitivity deduction. (Contributed by NM, 5-Aug-1993.) | 
| Ref | Expression | 
|---|---|
| eqtrd.1 | ⊢ (𝜑 → 𝐴 = 𝐵) | 
| eqtrd.2 | ⊢ (𝜑 → 𝐵 = 𝐶) | 
| Ref | Expression | 
|---|---|
| eqtrd | ⊢ (𝜑 → 𝐴 = 𝐶) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqtrd.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | eqtrd.2 | . . 3 ⊢ (𝜑 → 𝐵 = 𝐶) | |
| 3 | 2 | eqeq2d 2208 | . 2 ⊢ (𝜑 → (𝐴 = 𝐵 ↔ 𝐴 = 𝐶)) | 
| 4 | 1, 3 | mpbid 147 | 1 ⊢ (𝜑 → 𝐴 = 𝐶) | 
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